How to know if Baby's Head is down

Brittany • 27. Finally got my BFP after 11 cycles of TTC by using the SMEP, Preseed, and a whole lot of prayers!!
I am 29 weeks today and know he's still got time to move about. But I was curious if any of you ladies know how the doctor will tell if baby's head is down prior to delivery? I know they can tell with an Ultrasound but I've already gotten my 2 ultrasounds and won't get any more. I'm sure there's some way they can tell without an ultrasound. Does anyone know?