ready one of my friends told me she was expecting twins and I have to admit I did ask whether it had "just happened" - but in this context I know they were at the ivf stage with their first DC (didnt actually need ivf in the end but it was on the table). I hope it didn't offend her! Was none of my business really.
The "was it planned" question we got a lot with DD1 (we were also relatively young at the time in our circles). I actually didn't know what to say. It wasn't planned at such but wasn't a complete accident, as in, we knew how to use contraception and just didn't! I think people don't realise what a tricky, personal question it can be.
Anyway!
Good advice frozenfairy ... When I did pregnancy yoga they were quite careful about what exercises/movements you could do at what stages. i really need to look up classes again. Was so fit when I had DD1. Now my pelvis is already giving me grief if I do too much 
lil so happy for you!!!!!! And fish so glad you had a good scan too.
Only two days until mine now. Still havent heard back about the harmony blood test results. Called my ob and left a message yesterday and still nothing. Will be calling again tomorrow. Bit worried to be honest but trying not to be.