Sex and periods...

Hey all; I just had sec and my hubby didn’t pull out. We don’t use any form of BC and we have 3 boys already (one is just shy of a year old)... anyways we just had sex and he didn’t pull out. I was shocked, wasn’t expecting it at all. Anyways I’m supposed to get my period in 7 days and I have been EXTREMELY bitchy and my appetite has been through the roof.. all I want is chocolate. I know my body so I’m pretty positive my period is like around the corner cause I only crave chocolate and being super irritable and bitchy RIGHT before my period.... but I wanna know what the chances are that I could get pregnant from the sex we just had. And I know “you can get pregnant any time during unprotected sex” trust me I know. Just wanna know the chances.