helppppp

i should be getting my period on the 14, but my breast are so much tender than they always get before my period, also i have being notice that i get hungry every time, and lost weight ! i did a pregnacy test this last days since i had relationships on my most fertile days which were the 29,30,31 ,buuttt the test come negative, also had a dream of a pregnacy test positive !! super weird but in my last to MISCARRIAGES i would also do urine pregnacy test and they would come out negative when i was , soo i would had to go and do a blood one and it was positive -.- , does anybody know why this happens to me ,its just urine test dont work for me?