3 weeks late for AF

L
Hi all, I am currently 26 and TTC. I got off of birth control end of October and had an immediate AF, then one 31 days later. I was due for AF again on Christmas Day, and she never came. I am 3 weeks late and have had no symptoms of AF. Weird cramping and some ovary pain. I have taken 6-7HTP and all negative, one test I thought I saw a faint line but it was probably evap. line (pink dye). I would go to the doctor for a blood test, but I'm wondering...is this from stopping BC 3 months ago? When should I test again!? Any help/suggestions welcome!!!