Hello, I saw the dr today and she said the unusual pressure might have pushed my uterus 'forwards and down' - apparently they can move around if you're straining and the pelvic floor is weak. She mentioned being overweight is a factor. Nothing at all to be worried about during pregnancy as the uterus swells over the top of the pelvic cage and is supported that way (not a very good explanation of what she said but I get it). Just have to watch that I'm not having diff with urinating etc. Only concern might be that a further pregnancy could worsen the condition of my pelvic floor, so it's a case of exercise those PFMs over and over and over again (forever...)! I'll be Super Pelvic Floor Woman in no time, hahahaha!

Thanks for your comments and reassurance ladies.