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I consider O day the day after a positive OPK

The general rule of thumb is you will ovulate 12-26 hours after your first positive OPK. For me this time TTC I think it was day after the first positive OPK. First pregnancy pretty sure it was day of.

It all depends on *your* body. Here is what I wrote for someone else on the POAS thread - I hope it helps you:

Okay. Here goes. First, it depends on what time of day you are testing. Theoretically, you are supposed to O within 12-36 hours after your *first* + OPK if you test in the afternoon. (The LH surge starts in the morning, so is first detected in the afternoon.) Let's say you got your first + yesterday afternoon, it is very safe to assume you will O today or early tomorrow. BUT if you get your first + with FMU, then your surge started the day before and you are likely to O the day of your first + OPK or early the next day.

Some women have longer LH surges. I only test with FMU and I O the day after my first + OPK. Even if I get 3 days of +s, O is the day after the *first* + OPK. The only test that really matters is the first +, so you don't have to keep testing once you see the +.

If you don't get KU this month, I *highly* recommend that you read TCOYF and start temping next cycle. Even if you only temp for a few months (I stopped after 6 when we were TTC), it can give you SO much information about when you O in relation to + OPK results.

I assume you are watching your CM as well? Most women get watery or EWCM leading up to O... for me, the W/EWCM starts about 6 days before O. Most women also dry up completely at O or O+1, so your CM patterns can also help you pinpoint your O date.

If you use FF (which I recommend), you can set your detector settings to "OPK," and the system will give you an O date based on OPKs and CM using the system I described above.

Finally, start paying attention to your body. Around O, I get heaviness on one side, cramps, sharp O pains, backache, and headaches. The sharp O pains almost always line up with the day after my first + OPK.

it really depends - unless you are testing like 2-3 times a day it's hard to catch the exact peak of the surge, at which point you are expected to ovulate 12-24 hours later. You could get a + opk at the beginning or the end of the surge which could mean, depending on the time you test or temp, o day can be on the same day as your + opk or a day after. The only way for me to confirm was to keep temping every day and watch for the temp rise.