Early pregnancy worry

Mia

Hi has anyone here experienced a small burning sensation in the uterus after walking more than 30mins? I am 5 weeks pregnant and I am not sure what this is but I have to sit or lay down cause after awhile it feels like my uterus is falling but ofc it’s not because I’m back to normal after sitting for awhile. My appointment is on Friday but I really wanted to know what it is and what you all did to help it ?