Late period

I am legit so frustrated. Went off BC pill last month and we tried a bunch. I’ve been having crazy symptoms that are very different from when I normally get my period, and now my period is 3 days late but took 2 tests and both negative. Is there still hope? Or should I just write this month off as a loss? I’m afraid now I won’t get my period and then won’t know when I’m ovulating for next time 😕