Hello everyone :)

I am 29 years old & my boyfriend & I have both decided we are going to try to have a kid. He has one kid of his own as I have one of my own too. Well I am 9 days away from my period & we just had unprotected sex and he finished inside me last night. I know the chances of being pregnant is low due to not ovulating but has anyone been a week before period and had sex and got pregnant ? What are the chances. I’m curious . He’s curious and hoping my next period doesn’t come at all.