oh dear, I had all day sickness until nearly 19 weeks as well. I'm 34 weeks today and my 'new' problems are terrible heartburn which makes me sick sometimes, and back pain. Tired all the time too!!
Podpod, I had the same thing early pregnancy, I had a tummy, but have always had a tummy even before pregnancy! It just looked more noticable to me!
Antenatal yoga, I went to a class in Beckenham but found it difficult to get to without a car when my partner couldn't take me. I actually did them from 14 weeks and think it's quite good. You don't need to be further along to do it, although I was the least pregnant lady there at the time!
There is also an Antenatal Water Workout at Crystal Palace on Mondays at 6:30 pm. I do enjoy it but find as I'm still working it's too much for me to put in a full day at work then make my way to the class. I highly recommend it though, for any of you that are nearby. You don't need to be a member, you can pay per class (£5.50).
scgd > I have seen quite a few pregnant ladies in Sydenham. I never noticed it before, but since I've been pregnant I've seen about 4 women on my train getting on or off at Sydenham. Maybe you might have been one of them?