Hello...my girlfriend menstruation date was around 2 sept...but we had intercourse on 26 August night and 27 morning. I didn't ejaculate inside her vagina i remember accurately..... but during the intercourse she had vaginal bleeding...not heavy but a few drops were coming... ...after that she was having cramps and lower back pain on both sides...also the bleeding stopped on 28th August. At first we thought her periods came earlier...but now we are in doubt🥺🥺