Missed fertile period.

I think i missed my fertile period. I had neg opk on 9th(cd12). On the 10th it was peak (used CB digital). I opened another box to test again this morning(cd14) it was neg. I found it weird because usually you get two peak days. Im thinking about testing again after work or on my lunch hour. We did BD 5th &10th ( my husband is an EMT we are not home a lot at the same time) I'm hoping we didnt miss it. A bfp would be a wonderful 5 year anniversary present.