pregnancy??

Okay, so, I'm really bad a remembering to take my pill every night. Almost 2 weeks ago I slept with someone and he did not use a condom then 4 nights ago I slept with the same guy and we didn't use a condom then either. I'm about to go on vacation and I'm supposed to be on my period while I'm gone. I told my mom how I didn't want to be on my period while I was on vacation so she told me to go ahead and start taking the pills you take when you're on your period so I would have it now instead. I started those pills 2 nights ago and still haven't started. Could I be pregnant?