Anak, if you're experiencing painful discharge or bleeding down there, please go see your OB-GYN or go to the ER right away, hindi ito dapat palampasin, lalo na kung pregnant ka pa lang. Better safe than sorry talaga, especially with anything na may dugo or intense pain involved.
Once you've checked with your doctor and they've ruled out anything serious, they can explain exactly what's happening with your body. Sending you love, you're doing the right thing by asking!