Turn, Baby, Turn!

Does anyone know about what week of pregnancy this baby's supposed to turn to head downwards?! I went for my 3D ultrasound last Saturday (31 weeks) and the tech told me that she was still trans. Her head is on my right and her feet at my left... when is she supposed to turn and head into position??? Im already getting Braxton Hicks Contractions, shouldnt that mean shes getting close??? What does it feel like once she turns? Will the pressure in my lower abdomin go away? She feels so freakin heavy, sometimes its hard to walk!
Your advice/ thoughts would be appreciated!

My little one has been head down since 31 weeks and my mom said that it was early so idk ***WATCHING***

My baby has been head down since 16 weeks, she flips often but always gets back into the head down position.

My baby turned head down somewhere around 33 weeks. But some babies wait all the way until 38 weeks. I never felt him turn, I didn't even know it until they did and U/S and told me.

My little girl was head down since 28 weeks..no BH at that time..i started getting them consistantly around 30 to 31 weeks...at 32 weeks(last week) i think she turned or moved into a weird position...deff not head down cuz i dont have so much pressure down there.. once she is in head down you will feel a lot fo pressure down there esp when she starts getting bigger!