What Causes Blood From Vagina After Masturbation?

I'M 8 WEEKS PREGNANT I WENT TO THE BATHROOM AFTER I MASTURBATED AND WIPE MYSELF AND FOUND A SMALL RED BLOOD. THAT LOOK LIKE A SMALL CLOT AS IF I WAS ON MY PERIOD. I COULDN'T TELL IF ANY TISSUE WAS ATTACH. NO OTHER BLEEDING CONTINUE. I EVEN PUT MY FINGER INSIDE VAGINA TO SEE IF THERE WAS ANY MORE BLOOD AND THERE WASNT. IS THAT NORMAL?