If you had sex and he did not pull out

Patient: If you had sex and hE did not pull out and three days later your menstrual cycle came on, is it a possibility you can still get pregnant?

Doctor: Hello,Thanks for the query.If you have resumed your menses after 3 days of unprotected intercourse then there are no chances that you can be pregnant in this cycle as the endometrium is shed and implantation is unlikely. So rest assured you are pregnancy safe.Hope this helps.Regards