Why OPKs and BBT are so helpful!

I usually ovulate CD 12 or 13. However, this month my opk didn’t get fully dark/positive. It looks like my body tried though... I thought maybe I just missed a quick peak. But then my temp didn’t spike either... what to do? It’s even more important for me as I am using a known donor that lives many hours away and I can’t just have sex every other day to cover my fertile period. Then last night, five days after I usually get a positive, I took one of my last OPKs and found it was getting darker!

Luckily, my donor was available and I was able to make the hours long drive today to try again!