Low placenta in second trimester

At 13w2d My dr told me my placenta is low but it’s very common and it would get higher later, second appointment at 15w2d She said everything looks great but the placenta is still low but she doesn’t seem very concerned about it, in few days I’ll have another appointment at 18w2d if placenta is still low is there’s any chance it could go higher? How long does it take?

I’ve been reading about the causes and they say it could be from Multiple pregnancy, IVF and miscarriages

I had 2 miscarriages this year but it was early at 5w and This pregnancy i was carrying twins but 1 heartbeat stopped at 9w and also Via IVF,

Anyone been told they have low placenta then it got higher? Can you tell me your experience please?