Sorry to invade here but I sorta had the same problem at 1 point, I got my girlfriend pregnant because a condom split and I had no others, we both told our parents and they said it was a big mistake to have a child at the age we was, we were both 14 at the time and luckily(this does sound a bit sick) she lost the baby, it was a miscarriage, she was upset and I was releived but in your situation I think that the girl telling your parents that she didnt sleep with you might work for you.