Had unprotected sex 1 day after period

Hi All, I haven't been on "Any" contraceptive for 2 years. We use pull out. But on the 10th July we had sex and he finished inside me. My period finished the day before. Is it possible to conceive so soon after periods? Has this happened to anyone, or anyone got pregnant on your period?
Guess I must just wait and see when my period is due! X