6 days ago, my girlfriend and I got a little carried away in bed. We have never had intercourse, but that day we got pretty close. She likes to feel my penis close to her vagina, as we dream of one day sharing sex with eachother. I know that this was a terrible idea but I put my penis very close to her vagina. I started to stick it closer and closer until it was a little bit inside of the inner lips. Although, I did not enter the vagina. It is all quite a blur now but I remember at one point i saw a big string of pre-cum coming out of my penis as I was waving it back and forth (outside of her). This was after it had been BARELY inside of the inner lips. To my knowledge, I do not believe much (if any) pre-cum was present when I was a little bit inside the inner lips (one inch tops). Fast forward to today and she starts lightly bleeding out this brownish blood. Her period is supposed to start in a little less that a week and she said it did not seem like the start of her period. She also said that she never bleeds this brownish color. We are only 18 years old, from Christian families, and are going to college soon. This being said, we are in a great panic. Cannot sleep at night we are so scared. Please help! Is pregnancy a probability? Could this be Implantation Bleeding?