Head down or up?

becca

So ive only had 1 ultrasound at 20 weeks and my baby was heads up then. Im now 30 weeks and 3 days i have no clue if hes still heads up or not. Looks like i wont be getting another ultrasound which is ok im just worried that hes still heads up and i cant tell. I usually feel a hard ball at the very top of my stomach and i think its his head. But does anyone know how to tell if hes heads up