I am a size 22/24 and have nearly 39 weeks pregnant. I must admit, I think i just looked fat for most of my pregnancy when I did start to show, but it is obvious now that I am pregnant. On the plus side, I haven't put a pound in weight on and I have got no further stretch marks, so so far so good!!
I did see the anethetist because I have restricted jaw opening, but also my weight. They like to check your back and see where you carry the weight. I was fine for an epidural, they say it may take slightly longer to insert, but should be fine.
Good luck with the pregnancy and don't worry about it.
xx