Bleeding after sex,

Nykki • 19, Awesome
Sooo this is the thurd time that my boyfriend and I have engaged in sexual activity and after each time, I have bled after. The first time I lost my virginity, so bleedig was expected. But these past two times, I don't ubderstand why it continues to happen. Idk if this has ecver happened to anypne else, but any input is helpful.