Should I be worried?

I just started using low dose birth control pills.

I followed the instructions on the pamphlet.

I started to take bcp 3 days after my period ended. I started Feb 3 and waited 7 days before having unprotected sex.

I had sex on feb 12, the 10th day that I was on the pill. We used condoms but I’m afraid some precum might have leaked.

Today is the 5th day of my placebo week and I still haven’t gotten my period. Should I be worried?

Could I be pregnant? Is it normal not to bleed during the placebo week? When will I get my period?