Hello dear I understand your concern There is always chance of pregnancy in unprotected sex. You ejaculate on cotton wear and near thigh. If precum may come contact with vaginal opening then there is chance of pregnancy. But chance of pregnancy is nil if you did sex during safe phase of period. If you did sex in fertile phase of period then I pill should be taken to prevent unwanted pregnancy. Avoid stress, take healthy diet, drink plenty of water, do regular exercise. Use condom in future to prevent unwanted pregnancy. Hope this may help you Contact further if follow up needed Best regards Dr. Sagar