I lost my virginity about 2-3 weeks ago, and this Sunday was the start of my first period since then. The blood has been coming out slower then usual, and is much more brown and clumpy than red and viscous like usual (it almost kind of looks like coffee grounds?). I know having brown blood during a period can be normal and just means a slower flow or blood that’s been around for longer. I was just wondering if it was possible that the blood was leftover from the first time I had sex? Just trying to figure out a reason why my normal cycle would be so different this time around.
The only reason there would be blood from sex, is from your hymen breaking. That's on the outside of your vagina, so would be visible immediately after intercourse, & when you wiped after sex, as a fresh, red bleed. It wouldn't cause blood higher up in your vagina, or affect your periods.
I cannot think of any reason why intercourse would make your next period different. Only, perhaps, if you had contracted a sexually transmitted disease, & an infection was present & affecting you internally (I'm thinking discoloured or bloody mucus, for example).
It's possible to carry a sexually transmitted disease without symptoms, for some time, with some STDs, & some, even by a virgin. If you were both tested before having sex for the first time, though, then that would be unlikely.
Sometimes intercourse can make blood that's almost ready to come away from the uterus/cervix, come away sooner/more quickly, but that is usually in the few hours after sex.
Are you sure that this is a period? Is there any chance you could be pregnant? That could give you implantation bleeding, which can be a mixture of brown, or pink, or red blood. It's also possible to have what you think are period during pregnancy.
If not, then, as you say, brown blood can come commonly at the start or end of a period. It may just be one of those things. I get that, often.
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