Is my girlfriend pregnant? ?

It's really too early to tell. Even if she does start bleeding I would still take a test because I had implantation and I swore that it was my period. First I spotted a little here and there and then I had a heavy flow (sorry, I know you're a guy but that's the truth). I know it's tough but if it's been over 2 weeks since you had sex you can take a test. If not wait and get one. Tests aren't too expensive and the generic brands don't make any difference. They all work the same for the most part. Sometimes even 2 weeks is too early to tell. My friend got a negative result and was pregnant. The main indicator for me was I could smell from a mile away, and my breasts were sore. Every body is different so she may have some different symptoms. Just keep an eye on things and try to keep yourself busy. For me, I didn't start feeling ridiculously pregnant, I just felt a little funny. Good luck with everything!