Ejaculated inside my gf, two days later she had heavy period for 7days. 1week after her period she had this brown discharge, is she pregnant? *also took contraceptives for the first time after the day of unprotected sex?

"Brown discharge" after a "seven day period" may be post-ovulatory, but if next menstral cycle is delayed for five days, obtain a serum HCG test to be certain about pregnancy.

If she had a period after sex, she is not pregnant from that episode of sex. She may do a home pregnancy test 3-4 weeks after the episode of sex. . 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 : https://www.hopkinsmedicine.org/health/wellness-and-prevention/safer-sex-guidelines