So a friend told me that she recently had sex with someone. She told me she had unprotective sex a week after she finished her menstruation. 3 days after the intercourse, she noticed she had a brown watery discharged. She got panic, and ask me to buy a pregnancy test but i told her its too early to do a test. Is there any possibility that it could be an implantation bleeding? Her usual menstrual cycle starts at 17 of each month.