If I've been on the pill is it normal to still stress about pregnancy?

I've been on the pill for over a year take it right never get sick or take any medication, and take it perfectly every night, but this month was the first month I've let my man cum in me, and he has 3 times this month so far, is it normal to be scared that I still might be pregnant even tho I've been on the pill? And also what's the chance I could get pregnant?