We are ttc #2 and I've started using an OPK this month. We conceived our first successfully using the Answer OPK.
Recently, I've been having 28 day cycles, and I was doing the OPK in the afternoon. I thought I got a positive test on cd 10, which was 3 days after my period . Doing the math:
28-29 day cycle - ovulation cd 11-12 = ~17 day luteal phase
This would be super early for me (last time I had 9-10 day luteal phases). I was a little unsure if the tests were accurate so I started taking them in the morning as well as the afternoon and I noticed that the tests were much darker in the morning. I am not surprised by them being darker, but I got some dark tests in the morning while the afternoon test on the SAME DAY were barely visible. I'm not sure what to do going forward. Should I take them in the morning? Afternoon?
Any suggestions to help me get on a schedule?
Does anyone know just how sensitive these OPKs really are? I am using Answer 20 stick OPK.