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How old are you, generally when the cervix is erosive, there will be a faint blood streak in the vagina after intercourse, I suggest you go to the hospital for a check-up.
Is it the first time you have intercourse? The hymen is broken, you become a woman, not a child, be kind to yourself.
You need psychotic medicine for this! Violent sex? Haemorrhage? >>>More
Is it a lack of hygiene and a urinary tract infection? If this persists, it is recommended to go to the hospital for a check-up.
The black blood is caused by tears or inflammation inside, and it is indeed a bit violent.
And it may be that you have sex the day before your menstrual period, and it happens to coincide with your period, don't be nervous, if you still have irregular bleeding for more than 7 days, you have to go to the hospital for a checkup! I wish you a happy husband and wife!