I'm fucked.
I think I knocked up my girlfriend. She's 18 and I'm 16. She gets nausea in the morning, her breasts feel swollen, she gets light headed and she missed her period.
EDIT: And she's been having mood swings.
That sounds fucked up. Try to do some research on some other sites other than asking on MPGH. xD But it sounds like she's pregnant. :S
Test it. If you don't want it, abort it.