had a slip up!

Last night my hubby and I got into the heat of the moment and had sex. Unprotected. My son is almost 7 weeks old. I know you're most fertile during this time so please don't be too judgmental. We made a mistake clearly. Either way hubby and I will take what comes and be happy with it. But I was just curious as to how many ladies have had this happen and either ended up pregnant or was totally okay and had a period. I have not had my period yet since having my son. 

Thank you!