Birth Control - Should I start a new pill pack?

I am 19 and have been on birth control for 3 years. I am on the combination pill Junel Fe 1/20. The placebo pill row started 3 days ago and my period only lasted 2 days. So I'm in this weird stage where I'm not on my period, yet I'm still taking placebo pills and I'm not supposed to start a new pill pack until Sunday. I had sex today without any other form of contraception. It worries me that I had sex today and have not taken a pill! Am I considered fertile right now? Should I just start my new pill pack since my period is over? Or should I wait until Sunday, when I normally start over? Any answers are appreciated!!