SEX THE MORNING BEFORE PERIOD

Molly
had unprotected sex around 4 times starting around 11pm last night to and the last time being 11am this morning. Straight after finishing I went to the loo to clean up (as you do) and had started my period (my normal menstrual flow that requires sanitary towels) just wondering if there is any chance of pregnancy as the sex and period were so close together?