Same as above! I'm in US where we get weighed at every appointment. Was horrified to see I'd put on 5lb at 8weeks (and I'd had a 6 week appointment due to previous complications - so 5lb in 2 weeks!!). I think it was almost all water though as at my 16 weeks appointment last week I was still at that same weight which I think is more my real weight now.
Doctor didn't seem concerned at all, even at the original weight gain.