a little blood?

so this is the 2nd time this has happened after sex. last time I got my period and that was about 2weeks ago, but it only lasted 4days. This time we had sex, and 2days later I'm still bleeding little droplets when I pee. it's not a lot, so I know it's not my period again, although I have nexplanon which causes my period to be irregular, so I wouldn't be surprised.. when I woke after I pee it looks like a lot though so I'm not sure what to think of this. is it my period? a possible abrasion? (we were kinda rough) or just some spotting? I have no symptoms to indicate it being my period... And the last time I got my periodnit was like a bubble pipes in my vagina, blood everywhere. this is light, but heavy enough to make me curious..