My 2nd child was transverse then breech up until 38/39 weeks then turned head-down at the last minute.
My 3rd was transverse and turned head-down about 38 weeks.
Advice I was given to get baby in ideal position was to get on all fours with head near the floor, bum in the air.
You still have plenty of time for it to turn around. DD1 was head-down very early on (never engaged).