What Is The Problem In Getting Pregnant?

Hi, I am 32, M and My husband are TTC for past 1.6 yrs now. I had my last period on 21-May. post that i had slight spotting for almost 2 hrs on 29-Jun and later it was clear.. i scheduled an appointment with my doctor on 30th, in her clinic i had pregnancy test which came back negative, blood Pregn test also was negative, followed by several other tests which came back normal. Later i wen thru UV scanning, there my doctor told me probably you didnt ovulated then but ovulation is more likely to happen on 9-Jul. I have pretty regular periods and my cycle length is usually 30 / 32 days. and I m healthy. i was further scheduled for blood works on 10th and 17th Jul - these rounds confirmed i have ovulated and my progesterone levels are up to mark. Doctor told me you should get your periods by 22nd -Jul. but since 17-Jul i have started feeling sick, heavy feet, white watery discharge all day along, fatigue, no PMS but lower abdomanial cramps, heart burn.. thats the reason i had HPT on 21-Jul and it was faintly positive (12dpo). on 14 DPO i was scheduled for blood pregnancy test which was Big Fat No... Body says I am Pregnant ..!! Test says NO !! whats the matter ?? Can i still be pregnant ?? Or is there any other worry factor ?? Please help.