TTC for 10 months

Hi. So my husband and I have been trying for 10 months now. I was on a 3 cycles of Provera (June-August) and last month,my period was due Sept28 but I didnt get it until today. We BD within my fertile days last month. I dont have hpt at home, and I've read that you can use opk as hpt so I've tried one yesterday which came out positive. Today, I decided to try hpt but it turned out bfn. What is happening? Anyone here with the same experience? I dont know what to feel I am scheduled to go to my OBGYN tomorrow. Any idea why this is happening? 😞😔😞