Limited activity at 16 weeksloop

So I just got home from my doctor's appointment. I got the news that I will be on limited activity. Meaning I cant help with our big move in 24 days, I can lift my 2 year old but am not allowed to carry him for long periods, and basically anything but basic chores for the house I'm not allowed to do. They are worried about the issue of me having super strong Braxton hicks that dont subside with the intake of a bunch of water or tylenol. I've been told no medicines besides tylenol to take pain away and no medicine to help me relax. So no unison. My uterus stopped growing and grew very slow with my son and we experienced 2 miscarriages after he was born.

Has anyone ever experienced this and found out later on they had something wrong with their uterus or some other problem. I'm concerned that non of my doctors at 2 different hospitals with 4 different pregnancies have ever run any tests.

Edit: I am measuring where I am supposed to. So so far my uterus is on track. But I didnt start measuring small till 3rd Trimester with my son