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This is Dr. David
the blood could be coming from lacerations or trauma to her cervix or vaginal lining
this can happen if the sex was rough or prolonged or if you are large or if there was not enough lubrication during sex.
if she continues to bleed, she needs to see a gyn doctor to get a gyn examination to check for lacerations and trauma in the vaginal canal.
she should make sure she urinates and drinks plenty of fluids to prevent urinary tract infection.
let me know if you have questions.