How to Confirm Whether Sperm Went Inside: If you are concerned about whether sperm went inside during sexual intercourse, it's essential to understand some basic facts. Confirming if sperm entered the vagina can be challenging without medical testing, but there are some signs to look for: Penetration: If ejaculation occurs during penetration and there is no use of contraception, there is a possibility that sperm went inside. Ejaculation: If ejaculation happens outside the vagina but near the vaginal opening, sperm can still travel inside. Emergency Contraception: If you are worried about pregnancy, consider using emergency contraception within 72 hours of unprotected intercourse. Pregnancy Test: To be sure, take a pregnancy test a few weeks after the incident or consult a healthcare professional.