you can try to eat more frequently but eat less each time.
you can also ask your doctor to give you some "digestion tablets." mine contains aluminium & magnesium hydroxide. i also 成日都好似好飽咁 and it is just normal because of hormonal changes and some loosened "parts" (i forgot the name) in the digestive system.
no worries la. the 1st year of bb development is just as critical as the 40 weeks he/she is in your womb. just feed bb more nutritious food when he/she arrives i believe that as long as bb is healthy, weight doesn't really matter much, as he/she still has a year to catch up. actually, a medium-sized baby is easier on both bb's and mama's bodies during delivery.