Confused... 🤔

My last AF was on 9/2/17.. I used clear blue dual opk and got my solid smiley on sat 25/2/17.. DTD tues, thurs previous to that, the sat, sun & Monday. Started having twinging feelings like very mild pressure in my uterus area on sun 5/3/17 and they lasted on and off for few days. AF was due 1 or 2 days ago and no show yet but tests are BFN.. what's my chances of being pregnant. Been trying for 9 months.