https://boards.hellobee.com/ Pregnancy, Baby and Parenting blog, by Hellobee en Sun, 31 May 2026 14:55:23 +0000 https://boards.hellobee.com/topic/for-those-withe-longer-cycles-how-to-calculate-due-date#post-99605 Thu, 22 Mar 2012 19:07:21 +0000 erinpye 99605@https://boards.hellobee.com/ <p>I have 40-60 day cycles, so until my 12 week ultrasound that dated my pregnancy, I calculated that I was 2 weeks at the time I believe I ovulated. I was only 3 days off :) </p> https://boards.hellobee.com/topic/for-those-withe-longer-cycles-how-to-calculate-due-date#post-98301 Wed, 21 Mar 2012 14:10:42 +0000 birdofafeather 98301@https://boards.hellobee.com/ <p>this is really helpful as i'm TTC in a couple months and wondered this myself! thanks for the great advice ladies! </p> https://boards.hellobee.com/topic/for-those-withe-longer-cycles-how-to-calculate-due-date#post-98169 Wed, 21 Mar 2012 12:25:44 +0000 Running Elley 98169@https://boards.hellobee.com/ <p>@mrsjyw: I agree with MRSKC. I have longer cycles too, I O'd on CD27 of the cycle where we conceived. So my LMP was January 2nd but my O date was January 28th. I used an online calculator and it calculated me as being 2 weeks pregnant on the 28th and went from there.</p> <p>This due date calculator has the date you conceived option. I entered my O date there and it calculated my due date based on that (since LMP wouldn't be accurate) <a href="http://www.babycenter.com/pregnancy-due-date-calculator" rel="nofollow">http://www.babycenter.com/pregnancy-due-date-calculator</a>. </p> https://boards.hellobee.com/topic/for-those-withe-longer-cycles-how-to-calculate-due-date#post-98107 Wed, 21 Mar 2012 11:06:29 +0000 mrskc 98107@https://boards.hellobee.com/ <p>Totally didn't see your response before I posted that. lol </p> <p>I would say you are 5w5d along going off your ovulation date. </p> https://boards.hellobee.com/topic/for-those-withe-longer-cycles-how-to-calculate-due-date#post-98103 Wed, 21 Mar 2012 11:04:37 +0000 mrskc 98103@https://boards.hellobee.com/ <p>If you have longer cycles going off your ovulation date will be more accurate. Counting from your LMP assumes you ovulated on day 14. Use the baby center calculator and go off date of conception and put your ovulation date in there. From the date you ovulated, you're already considered two weeks pregnant. Count forward 38 weeks from your ovulation date, and you get your due date. </p> <p>For example, for me my LMP was Jan 9th which gives me a EDD of 10/15. But I know I ovulated around Feb 2nd which gives me a EDD of 10/25. I went off my 10/25 due date for how far along I am. Your doc will go off your LMP until you have a dating U/S. At my first U/S, I measured exactly how far along I thought I was going off my ovulation date. Going by my LMP I should've been 8w2d but baby measured 6w6d. Gosh I hope what I wrote makes sense. </p> https://boards.hellobee.com/topic/for-those-withe-longer-cycles-how-to-calculate-due-date#post-98094 Wed, 21 Mar 2012 10:46:59 +0000 mrsjyw 98094@https://boards.hellobee.com/ <p>Thank you for the help everyone, I have one more question.</p> <p>So I calculated based on my O day and the EDD is November 16... so does that technically make me only FIVE weeks, instead of the SIX weeks (based on my feb 3 LMP date)?</p> <p>or am I still Six weeks along in my pregnancy, with fetal age being 1 week younger than I had originally thought? </p> https://boards.hellobee.com/topic/for-those-withe-longer-cycles-how-to-calculate-due-date#post-98091 Wed, 21 Mar 2012 10:38:53 +0000 SAHM0811 98091@https://boards.hellobee.com/ <p>mamabolt said it best. </p> <p>since you were actively trying and know your O date/conception date, go by that (e.g. baby center has two calculators, one based on LMP and one based on O date. use the O date one). if your O date is accurate, a dating ultrasound will probably reflect the same or a very similar due date. </p> https://boards.hellobee.com/topic/for-those-withe-longer-cycles-how-to-calculate-due-date#post-98017 Wed, 21 Mar 2012 09:11:23 +0000 heffalump 98017@https://boards.hellobee.com/ <p>The good news is... due dates are rarely accurate anyway. Hope you figure it out though, I'm sure your doctor will give you an answer. </p> https://boards.hellobee.com/topic/for-those-withe-longer-cycles-how-to-calculate-due-date#post-98014 Wed, 21 Mar 2012 09:08:49 +0000 twogirls 98014@https://boards.hellobee.com/ <p>I have long cycle also sometimes with 40+ days. The doctor calculate my due date from sonogram measurements. My 1st one LMP was 2/1 and due date was 11/16. My 2nd one LMP was 3/6 and my due date was 12/17. </p> https://boards.hellobee.com/topic/for-those-withe-longer-cycles-how-to-calculate-due-date#post-98007 Wed, 21 Mar 2012 09:04:00 +0000 regberadaisy 98007@https://boards.hellobee.com/ <p>The length of your cycle actually does not matter in calculating your EDD. My cycles also average about 34-36 days. With some of them being 40+!<br /> You start counting how many weeks you're pregnant from the first day of your LMP. Weird, I know. By the time you get a BFP you're already X weeks pregnant even though conception as not happened by that point.</p> <p>I used online calculators from WTE and The Bump and they were both accurate. </p> https://boards.hellobee.com/topic/for-those-withe-longer-cycles-how-to-calculate-due-date#post-98001 Wed, 21 Mar 2012 08:49:24 +0000 Andrea 98001@https://boards.hellobee.com/ <p>have you used the online calculators using your ovulation date since you know it? </p> https://boards.hellobee.com/topic/for-those-withe-longer-cycles-how-to-calculate-due-date#post-97995 Wed, 21 Mar 2012 08:44:39 +0000 mamabolt 97995@https://boards.hellobee.com/ <p>You count your weeks assuming you were 2 weeks preggo on the date you Oed. Congratulations! </p> https://boards.hellobee.com/topic/for-those-withe-longer-cycles-how-to-calculate-due-date#post-97989 Wed, 21 Mar 2012 08:43:23 +0000 hellobeeboston 97989@https://boards.hellobee.com/ <p>@mrsjyw: hopefully someone else will have a good explanation for you, but I can tell you my timing. I also had longer cycles and ovulated later. My LMP was 1/12, O date around cycle day 20 or 21, I had an ultra sound at what I thought was 7 weeks, but the babe measured 6w2d, so because I my later ovulation date I couldn't really go by LMP... It was a week later basically --- do you have a dating ultrasound planned? Then they will be able to measure and tell you for sure! </p> https://boards.hellobee.com/topic/for-those-withe-longer-cycles-how-to-calculate-due-date#post-97986 Wed, 21 Mar 2012 08:41:29 +0000 winniebee 97986@https://boards.hellobee.com/ <p>I think they have some calculators online that calculate by conception date or ovulation date! </p> <p>If you count from the 1st day of last period, your due date won't be exactly accurate. But, at your first ultrasound, they will date your pregnancy for you by the size of the baby, so you'll know for sure then. (And apparently the early ultrasound is the most accurate way to tell how far along you are!) </p> https://boards.hellobee.com/topic/for-those-withe-longer-cycles-how-to-calculate-due-date#post-97982 Wed, 21 Mar 2012 08:32:35 +0000 mrsjyw 97982@https://boards.hellobee.com/ <p>The first date of my LMP was Feb 3.<br /> I O'ed on Feb. 24.<br /> I got my Bfp on March 9. (Not that this matters).</p> <p>I know that November 9 would be my EDD if I was on a normal 28 day cycle. But being that I average a 36 day cycle, I'm assuming my EDD would be November 16. </p> <p>The part that I'm confused about is how many weeks along I am (do I still count from the day of my LMP?) </p>