Weighed myself this morning at 34weeks and am shocked - I was 8st 6lb at 9-week booking in appointment (I'm 5' 7") and this morning the scales said 10stone 10.5lbs 
that is a gain of 5lb since last Wednesday and more than half a stone in a fortnight! Wtf is happening!! We've just been to Devon for a week where my diet was less healthy than usual (fish and chips a couple of times and puddings / ice creams pretty much every day), but surely this is extreme? At this rate I'll have gained another stone and a half by the time I have the baby!
Please give me some advice, I don't want to diet but I also don't want to be much heavier as I'm already feeling sluggish and like my lungs are heart are being constricted.