Anyone has her placenta close to the cervix?

Amne
I'm 20 weeks now, my ultrasound shows that my placenta is down near my cervix but there is no bleeding yet i didn't see my doctor yet as my appointment is in 2 weeks what can i do ? And is it possible for my placenta to come up again I'm so worried as i had cesarean in my first baby i don't wanna have it again