Need help from the experts...

Brittany
Here's my abbreviated shorty:
​My husband and I TTC for 2 months before we became pregnant with our first baby. Unfortunately we lost him/her at 6.5 weeks in February. My doc recommended waiting for 1 cycle, which we did and it came about 5.5 weeks after the MC. We started TTC right away and I had a positive digital opk on cd22. It's now cd 40 and no AF with 2 bfn!  Help!  What should I do?  Wait it out for AF?  Buy more OPKs and assume I skipped this month?  Call my doc?  Help!