Trouble peeing?

The past couple days iv had such a ga4d time peeing.. in 38 weeks and 4 days pregnant. When I sit on the toilet i can tell I really really have to go. It nothing comes out. I sit there for 2-3 minutes before I can go. And to even go I have to move all around like sometime I'll lean side ways, open my legs the whole way, sit straight up or bend the whole way over... I can't just sir down and pee. What could be the problem? Could it be the way baby is laying?