Whats the possibility i am pregnant?

I had unprotected 4 times the last time was 31st May, I was due my period 20th June but it didnt come till the 28th and it only lasted 2days and it was quite heavy. I have really sore/tingly/painful , headaches, cramps, i fainted a few days ago, i feel tired alot, i feel bloated and really sick, i havent been eating alot because food hasnt seemed appealing to me lately, and this morning i was almost sick. Ive took 2 pregnancy test cause i didnt want to worry, they both turned out negative so i didnt worry but then ive been getting alot of pregnancy symtoms and my period was late and shorter than usual. I just dont know what to do, but what is the possiblity of me being pregnant?