Bump size and fetal weight

Everyone's pregnancy is different. I'm a middle size woman and my bump is like those carrying twins. Not my 1st pregnancy hence I showed way earlier in the 1st tri. I also don't eat for 2 as not to gain any unnecessary weight & also because I feel full really quick even with just a slice of bread. I only gained 2kg so far. My daughter told me everyone looked at my tummy like 1 kind 😅 No doubt it's heavy. Almost 31 weeks now.