placenta previa

ann

i had an anomaly scan at 21 weeks and it was seen that i had a low lying placenta covering full of my cervix. iam at 26 weeks now and i had a monthly a while ago. my OB told me to be wary of any bleeding... i ddnt have any bleeding from 21 weeks until now ( thank God! ) but iam just so worried. this is my first baby and we waited for a long time for this angel. anyone has this issue before? did it turn out good? please i need assurance!