Hi, I just had my 20 week scan ytd. And my gynae said I have low placenta. He said to refrain from sex and to see him if there's any bleeding. The report stated: posterior lying low, reaching os. Maturity grade 0. I'm abit worried. I had a c-sect during my 1st pregnancy & I read up that it's 50% for the placenta to move up. Anything else that I need to take note of? Anyone experience this be4? Any advise? Thx!