Should I still be bleeding after my second time?

Right....ok...well ill just get straight to it then. my boyfriend and i had sex for the first time about 3 weeks ago...and seeing as he is my first I knew I would bleed at least the first time with him, i bled for about a day or so. After that we decided to let me heal before doing it again, we waited a week, though didnt have sex again, he just masturbated me, yet i bled when he did this, though i didnt bleed as long. So we left it a while longer....when he masturbated me again I didnt bleed. We had sex again and I bled again, though I bled quite a bit this time, though it stopped quickly. oh and yes...we are using protection. And no it didnt hurt during or after.

Im just wondering, is this normal for me to bleed like this? Is it because I could still be stretching? Or is this something that i should get checked out?

thanks :-)