So My Last Period Was Monday April Fourth. I Started

So my last period was Monday April fourth. I started my birth control the next Sunday. I only took it for two weeks and stopped the week of the 15 which is when I usually ovulate. However the second week I was on it I was also on a very strong dose of antibiotics. My fiance and I had unprotected sex multiple times the next couple weeks without him even pulling out. I have no missed my period, have been extremely tired, very moody, and have a white milky discharge that is very consistent. Also some mild dull cramps. I took a clear blue pregnancy test today and it took forever for the results to show, but when they did they were negative. I'm so confused. Is there s possibility I could still be pregnant? ? Help asap