Could I be pregnant?? HELP

Kayleigh

I'm on the pill. I've already completed 1 pack but skipped the inactive pills because I was going on vacation and didn't want my period. I went straight to my new pack I am on the first pill of the second week. My boyfriend and I had unprotected sex 4 times in a span of 2 days. Could I have gotten pregnant? I've never missed a pill or have been late on one. Yesterday I had a little bit of brown blood and now it's red like a light period.