I've just looked at a photo I have on my phone of me at 17 weeks and it looks quite similar to you hun. I could still do my size 10 work trousers up until 17 and a half weeks... Then all of a sudden at 18 weeks a proper bump popped out! Then it seemed to get even bigger again at 21 weeks, I just turned round one day and thought 'god where did that come from', lolit will come!
How are you feeling now lovely? Hope the horrible sickness has subsided! Xxx