Pregnant and toddlers questions

Im 5’7 and thin build. This is my second pregnancy(my first was twins) and Im just over 6 weeks pregnant now.

Im super bloated feeling. I know I cant be showing this soon.

My twins are constantly climbing on me and sitting in my lap. I feel a lot of pressure and have to make them move after a minute. When I lay flat, I swear I can already feel the firm “bump” I felt in first pregnancy like the top of my uterus though super low still. Is that possible this early?

And is it okay if my twins are climbing on me? I dont let them jump and try to prevent bouncing. How do you ladies do pregnancy with toddlers? Lol