Late/no period while on birth control

So I started BC on April 1st 2019 and I was taking it every day of course, same time. I hadn’t had sex since February 14, 2019. On 2/14/19, I took a Plan B after an accident and had 2 periods after that. So, now on Saturday, 4/20/19, I had sex for the first time since Valentine’s Day. We didn’t put a condom on because I’m on the pill. He didn’t cum/finish inside me.

I’m worried though Bc i was supposed to get my period on Friday 4/19/19 and i haven’t gotten it. My friend told me it could be because of the birth control since I hadn’t had sex until this Saturday and I was already a day “late” and I was on the pill already. Help??