Thank you so much, people :)
Just how slim are the odds? Say, on a scale of 1-1000?
I'm sure she'll be fine since the odds are so slim. But if you are having anxiety issues and don't want her to get pregnant why don't you avoid any circumstances where there is even a possibility? Sex was made for reproduction so until your ready to face those chances then I would avoid doing anything. Also before you actually have sex (since you seem kinda close) have her get on birth control (its free if she goes to planned parenthood) and be one it for a month and back it up with condoms.
the odds are really low and most likely she is not pregnant but you need to be more careful. It seems like you are getting closer and closer to the real thing and your girlfriend can get pregnant the very first time you have sex, plus what you guys are doing now can spread sexually transmitted diseases if one of you have one.
Just wait and see if it comes. I'm sure it will though, so don't concern yourself about it. Just use it as a lesson and take more precaution in future sexual acts. You're both quite young, and there's no point in rushing things. You have the rest of your life for that stuff.
She hasn't had her period since this occurrence, but she's had it since the first time our genitalia met. She's scheduled to get her period soon.
If she's had a period, then no you have nothing to worry about. However, be warned that even genital to genital contact can get you pregnant. The odds are quite slim, but it does happen. To prevent future scares, always use a condom before any form of contact occurs.