scan for placenta at 36 weeks!

Ok just wondering I'm expecting 3rd baby December but at my 22 week scan in holles street my midwife said I had to go back for a placenta scan I thought nothing of it til know I don't think this is normal could it be possible I have placenta previa??I don't get alot of movement in 26 weeks tomorrow?

It's totally normal. When the placenta is lying low they will schedule a scan at 34/36 weeks to check again. Majority of cases will move themselves, they did in both my pregnancies. Yes there is a chance it is previa, but tbh they would Monitor you a lot closer if they thought it was. Don't worry about it, honestly.