Skipping a period

I was lined up to have my period over a really important day where I wouldn’t have time to deal with it and all of the other things going on throughout the day, so I started a new pack of birth control and just skipped over my period. I haven’t done that in a long time, but my boobs are getting bigger and I’m gaining a little bit of weight. Should I be concerned of being pregnant since I skipped over my period. (And yes I did have sex and know that I can’t get pregnant w/o doing that). But should I be nervous?????