bled during sex twice? not my period, im sure?

so im 15... im a lesbian (Y).

me and my gf have had sex plenty of times...
came on a sunday and had a fair bit of sex that night and then again on the monday and ended up bleeding & it lasted half a day at the most.
Diddnt bleed for the rest of that week.
She came to see me again the sunday after and had sex again that night and then monday morning again and then again in the evening and bled again for about half a day?

It cant be my period either cause they dont last half a day one week and then again the week after?
Usually comes really heavily for about 6 days?

Whats the reason and how can i stop it?
& please dont be ignorant. its not appreciated.
 
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