The onlt thing to say is to go and get checked by a doctor
My doc told me that 40 % of pregnancies have bleeding at different times for a lot of different reasons. It could be old blood where the baby is implanting, it could be placenta, or that your cervix is raw and bleeding, (all normal) and these were just a few he named. I wouldn't worry too much unless you have heavy red bleeding and cramps. However, if it persists, which I experienced, they may run blood tests to check the viability. Good luck!