Me and my girlfriend both 18 had recently lost our virginity to each other a month or two ago, she bled and her vagina hurt for a few days, two weeks later we had intercourse again gently and all went well until 3 days ago when we were having sex again we tried changing a few positions and going a little harder suddenly there was more than a little blood. 2 weeks after her losing virginity she also had a sharp stomach ache and when diagnosed there were 2 very small knots. is the bleeding still normal? and if yes then how can we avoid it.