Mama, this needs a doctor's check talaga, please don't wait on this one, lalo na may blood involved. Call your OB or go to the clinic/ER para ma-examine kayo agad, kasi may maraming reasons ito at kailangan ng professional assessment.
I know nakakakaba, but better safe than sorry with anything involving bleeding, isang quick visit lang and you'll have peace of mind. Sending you strength, ate!