Hello, my girlfriend and i had unprotected sex two days after the end of her period. i am not sure if i came inside of her or not, but i don't think i?

See below: Pregnancy can occur from sex on any day of the cycle. If sex was within in 72 hours earlier from now, your GF should take plan B. If it is late for that, then, If she misses her period by 4-5 days, do a home pregnancy test. If the result is negative repeat the test 4-5 days later unless she gets a period by then. Use first morning urine and follow the instructions for the test carefully. If you do not wish to be pregnant, use contraception all the time, every time. You may consider implanted contraceptive, or IUD. Practice safe sex. Get HPV vaccine.