Is my girlfriend for real ?

ok im 14 coming up 15. My friends like been telling me i should get layed and stuff. my twin chad has already got layed. h set me up with his friend. and like we went to the movie and like when i was walking her back to her's she said her parents weren't in. so like we kinda did it. i was amazing, it wasnt herfrst time shes 16. her names tasha. and after that night we came like real close in school, she was always wit me and i was with her and ****. we did another 4 times. and last time w did it was like 8 weeks ago. last night she called me and said she was pregnat. shesaid she took a test and it said she was pregnat and she was been for like 2 weeks. andthen she asked if i could come over. so i did and she took another test in and it siad h was pregnat. i asked her to get and abortion but she refuses 2. im like panicing. i dont knw what im going to tell my mum or her dad. he would kill me his a big meat head. im lik really scared what should i do. she wotn have an abortin and stuff so like im worrried i dont wanna be come a father. and like i knowi should of yusd a condom but she said it was ok and i wouldnt need one. im proper scared. help ?