Evening,

So my GF is on the pill, and she doesnt miss a day and is very responsable when it comes to her time etc. During this last cycle she was perfect and her menstruation period came as expected which was Thursday morning/afternoon. Today, friday during a movie I grabbed her breast and got aroused and I think you know pretty much where it goes from here.
I came inside of her during her second day of her menstrual period (no condom and came inside).
I know that women without BC pills during the menstrual period can become pregnatn (very low % of course) -- But since my GF has been on the pill for about a year now and we have intercourse regularly and never has there been a mishap; I would like to know what are the chances of her getting pregnant during her menstrual period in between the BC pills cycle.
I believe she starts her pill again on Monday for a fresh new cycle.

I hope this was pretty informative and my question is understood,
Thanks.