Educate me I need help

B • Proud mommy to a beautiful princess & loving wife!💕

So just now me and my husband had unprotected sex and he came in me 2x I'm on birth control and have been since my 6 week visit.

My question is how likely is it for me to get pregnant? I'll be taking my first non hormonal pill today

Please help I'm still new to this BC thing and I want to make sure I know I'll start my period either today or tomorrow after taking it.... or should I just trick my body and skip them altogether?