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You can start them whenever you like, maybe day 8 of your cycle? When it turns positive you are going to ovulate in the next day or two, so get busy! I'd start with a cheap brand like wondfo so you can use a lot. And if you're unsure about when it's positive, just have sex every other day or at least every 3 days!

That's the spark notes version, but I recommend joining in on the POAS thread to chat with others who are going through the same thing!

@Mrs. Taco: oh yeah you can pee on all the things! Also when you get your opks I suggest getting some of those teeny bathroom cups, makes it easier to just dip your tests instead of actually peeing on them.

I agree with @anya says, Day 8 sounds like a good time to start, because the "average" day to ovulate is day 14 and OPKs predict it a couple of days in advance. However, some people ovulate earlier, and so you wouldn't want to miss it!

I'd also recommend saving your OPKs for at least the first cycle, so you can compare the lines and learn what a positive OPK *really* looks like. The Wondfo brand has worked really well for me, and the lines are pretty clear once you get used to reading them.

So basically, buy a pack of 20+ Wondfos, start using them on day 8, use them until you get two good solid lines ("positive"), and then I would keep using them until about 5 days after that, just to see them turn back to "negative." Start to BD more often when you see those two lines, and don't stop until the 2nd line starts to disappear

They tell you when you are ovulating / fertile. Just coming off an IUD, I don't know how long it will take for your cycles to normalize.

Hope this helps! Good luck!

@Mrs. Taco: using Fertility Friend helps take the guessing out of patterns! Haha we can be crazy together! DS is November