Opk testing and chances

Kendall
Yesterday I took a digital ovulation test around 2 and it said yes 
So I took a test strip just to be sure and it was positive as well 
Well my husband wasn't home until around 930 and we weren't able to have sex tell 10 that night 
Around 9 I started to have cramping below my hip area 
Do you think I missed the window of time??