Low lying placenta

Felicia
Does anyone have any low lying placenta stories?
I had my 28 week checkup today and was told that my placenta is a bit low from a checkup scan from 26 weeks. I'm at 2.3 cm and not sure if I should be concerned or not?
My doctor didn't seem too concerned, and I have a scan in about a week to check on it. I was told to rest, take it easy as much as possible and not working out/no intercourse until at least we check it out. Anyone have any stories??