Is this a fake pregnancy?

I have a girlfriend who is in her third year in campus. We have been dating for about one month, but something very strange happened. We got intimate on our first date and since I wasn’t prepared for it, I didn’t have condoms so it was unprotected. Last week she told me she was pregnant. This has puzzled me because she said she discovered this about ten days after we had sex. She says she is not ready to have a baby, which I agree with, but I don’t think that baby is mine. Is there a way I can ascertain this because if the baby is mine, I can help her out of the situation so that she completes her studies.

{Paul}