I need some hope

I have been on birth control since I was 13. My fiancé and I decided that we should start ttc. I came off feb *14. Did not have a period for Feb, March, and April. Went to my OBGYN and I was prescribed a pill to help me start. He said to count days 12,14, & 16 and have sex on those days and every other after that. We followed his directions and now I am 3 days late with a BFN and no sign of AF in the future. Someone please tell me that you have had a story like this and that it worked out ok!