Maybe pregnant?

This past month I've partied a lot. A lot of drinking and cocaine. I'm not a regular cocaine user, but I did it a couple times this past month. I'm now starting to think I might be pregnant. My period isn't expected for another couple of weeks and my breasts are tender and my stomache is noticeably larger. My question is, if I am pregnant, will this past month of heavy drinking and occasional cocaine use affect anything?