bump too small at 39+2. should I worry?

Petra
I am measuring quite small at 39+2 days. Basically I've always measured small and every time they refer me for a scan the scan reveals that my baby growing perfectly fine and at a rate it should be. Yesterday I went for my midwife appointment and she said that she can't tell if my baby is head down or not so I would need a scan to confirm. I'm a bit worried. Does that mean there's something wrong with my baby? I'm due on Monday 17th April. What would my options be if my baby is not head down? My whole pregnancy has been smooth until now (6 days to go). I'm scared. Please advice☹️☹️😘