Thanks for all the replies guys.

- I'm certain of the conception date (that old phrase "it can only take one time" proved true for me)
- Twins... Not sure. My Nana is a twin and so is my husbands Nana, so I guess it's a possibility, but I've pretty much had no MS, and I thought that all pregnancy symptoms are heightened with twins etc
- and yes we have started to tell everyone (a few people guessed based on my bump)

I'm seeing OB on Tuesday, so no doubt she'll have an opinion.

Thanks again xx