So confused about what is happening to my period

I've been on birth control -the pill- for two years . Here and there I have switched which brand but for about the past year I was on the same one.

I randomly didn't get my period this month. Is this normal after having a normal period schedule for the past two years ?

My bf did cum inside me but I was on my period so the chances are already small and even more so because I was on my period. Which I never mess up taking it.

Anyone have any idea what's going on or have similair experiences ?