I need advice! Please read and answer!

I'm on birth control. Have taken it basically perfect everyday. My boyfriend used a condom and pulled out. I wasn't really expecting it, but he pushed right back in with his cum still in the condom. Later on he pulls out and the condom must have fallen off while he was in me... I pulled it out pretty carefully so I wouldn't spill it. I think I'm good, but I came home a few hours later went to the bathroom and very light blood appeared on the toilet paper.  What could it be?? We've had sex before so I'm pretty sure it's not the breaking of my hymen. But he did finger me before and he dug me with one of his nails.... I mean I guess it could be anything but I'm kinda freaking out. I'm also not supposed to get my period for another week.