Average weight gain in first trimester ?

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my weight gain has been in fits and starts, I started by losing a bit of weight, then gaining, then nothing, then gaining again, and for the last 2 weeks I have put on nothing. at my 26wk scan the fundus measured 26cm so Im spot an and not worrying about anything. aparently when I am (27wks) average weight gain is 8-10kg (6.4 = 1st) So i have gained less weight than I should have, even though everyone seems to comment on how big my bump is for 6 months. I have now been on a major healthy eating shop today and have bought loads of fruit and veg, fish and chicken, managed to not even enter the frozen section or the crisps and chocolate isles. Im trying to eat in a way that would make Gillian McKeith proud so I dont gain weight to rapidly now and hopefully avoid the dreaded stretch marks, plus give my baby a super healthy start to live with all th nutrients it needs!