GYo, I think you are right about the baby having more room to grow up rather than out, have heard that before (me being a short arse didn't take much notice of it!!)
Party is tomorrow I am just doing the last few bits (MIL is coming so read last few bits as cleaning!) Have got to that stage where you think "why on earth did we start this?" LOL It'll be right by tomorrow!
I think my gut instinct is that everything is OK with the pregnancy, but then I have thoughts of my sister, and the fact that by 18 weeks with both of mine I was getting hourly big kicks and with DS2 you could even see the kicks from the outside, so then I think well maybe the difference in pregnancies means it's a girl, and then I think about the stupid family theory of not being able to carry girls, and although that is a very interesting theory when I'm not pregnant, when I am pregnant it scares the hell out of me...... I am going back to stick my head in that sand, things seem much lovlier in there!
One thing though, my sister's later MC's (which in actual fact were terminations rather than MC's, anyway....) were down to one baby having severe DS, the other SB, (which is what is worrying me) but I should get my triple test results this week, so I might be able to relax when they've come.