Only gained 2 lbs in the 2nd trimester after losing 4lbs in the 1st

Gemia • Due may 6th with baby #3 haven't done this since 2003 so wish me luck❤💖
I eat constantly and have not been sick at all. Don't understand, I don't even feel the baby moving I'm 18wks. Docs say everything is great but I'm worried.