Are you sure it is vaginal bleeding? If it is during passing urine, it could also be blood in urine, which could be due to urine infection.
If this was the first time you have had sex, then it could be vaginal bleeding from trauma to vagina.
It could be uterine bleeding, maybe a period.
I understand your concerns as you are sixteen, but health comes first, and you should see a doctor, to determine the cause and treatment for your bleeding. As you are very young, it is all the more important for you to get checked out.
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