i think i might be pregnant but i am not sure. If i am i will be about 3 or 4 weeks. about a week and a half ago i noticed that i was bleeding, it was super light and i didn't even need a panty liner (it was a week b4 i was supposed to get my period)...an hour later it was gone. the next morning i was bleeding the same way, it went away that night...the next day i was bleeding again, and it went away again. the next couple of days i had stomach pains, and what i think was heart burn. i have been so tired lately, and extremely emotional. my appetite has gone down dramatically, i will eat something than feel sick...and then other times i can eat something and be fine. my sister in law is pregnant and she told me that i could be pregnant, she said that if my nipples are getting darker and my breasts are harder than i am probably pregnant. my nipples are way darker than normal, and my breasts are harder. however even with all of these symptoms i took 4 pregnancy tests and they all came up negative. could i be pregnant?