Hello dear I understand your concern Just be relax and pregnancy is not possible in your act. Both of you are on the clothes and no precum enter in the vagina. To become pregnant, penetrative sexula intercourse of penetration up to vaginal introitus with or without ejaculation in fertile phase of the period is required. Avoid stress, take healthy diet, drink plenty of water and do regular exercise. Use barrier contraceptive like condom and diaphragm to prevent unwanted pregnancy in future. Hope this may help you Contact HCM for further health query Best regards Dr.Sagar