If the guy cums inside in, your vagina. Then theres a chance specially if it happened in your ovulation period. Theres chance that youre not pregnant if it happened 7-days before or after of your next predicted period.
that is known as spotting or implantation bleeding. you could be pregnant. i would suggest waiting two the three weeks since the day you had unprotected sex, then it should give you an accurate result! best of luck