BBT and OPK Confusion

[juleswa]

Here's the scenario:

Positive OPK on Friday night but temp didn't spike untill Tuesday meaning O was on Monday. Does anyone know if it's possible to have O'd even a day or so before temp spikes or is it definately only then?

[principessa76]

Hi,

Its definitely possible to O a few days before the temp rise. I've read it can take up to 3 days for your BBT to go up. Fertility Friend always counts O as the last day before temp rise but I know this isn't always the case. If you got +ve OPK on Friday then you could have O'd Saturday or Sunday and then had it take a day or so for the temp to go up. My last couple of natural cycles my temp went up at 2DPO.

Hope this helps

[{sarah}]

You ovulate 36 hours after the LH surge which is what the OPK picks up. Maybe the one on Friday night picked up the beginning of the surge & you ovulated later. The temp rise is caused by progesterone which is released immediately after ovulation so the very next day after ovulation your temp should be rising.