AM I PREGNANT?

Vanessa • el leche
Im 15, and Ive been sexually active, and we havent used a condom in months. He pulls out and cums on me or on he bed. 
He said he didnt cum im me, and I know he didnt because he pulls out and jacks off for like a minute then cums. But my period came 7 days late, and we bought 3 pregnancy tests, and 1 couldnt read my urine, and the other two were negative. My mom is really against teen pregnancy, and she knows im not a virgin, but when she found out, she flipped. She still brings it up. Ive searched symptoms of pregnancy and I dont feel any of them but sore breasts and cramps, which is what I usually feel when I get my period. Am I pregnant?