Pulling feeling in uterus

This is my third pregnancy (1st was an early MC, 2nd was healthy girl). I’m about 6 weeks and feeling a lot of pulling and stretching in my uterus, especially when I bend over or lift anything. I don’t remember feeling this way in my previous pregnancy. I’m not doing anything too strenuous or lifting anything heavy but it’s making me nervous to do even just normal everyday stuff around the house, if the pulling feeling might be harmful. Anyone else experiencing this?