I Have Some Questions About My Contraceptive Pill....I Was On

I have some questions about my contraceptive pill....I was on rigevedon for one cycle then my doctor switched me to gedarel and I have taken one pack of that and am currently in my break week. My period has come, but there has been very little bleeding compared to my normal. When taking rigevedon initially I had unprotected sex 2 and a half weeks into the packet, should I be worried about pregnancy?