4 + 5 weeks

This is my 3rd baby, I am usually slim, under average weight for my height (normally haven’t weighed since found out I was pregnant 5 days ago) My weight fluctuates during the year between 7.6-7.11 (stones & pounds) .. i can’t get over how big my belly has got so quickly (obviously I know most of it is probably bloat) the nausea is the worst it’s ever been it’s taken over every evening. Starting to think it might be twins???