Kizzie, I was the same with my twin boys but they "only" weighed 5lb and 5lb 4oz. I spent the last month and a half mostly on the sofa as I could barely move and they arrived 4 weeks early after an emergency c-section when I developed eclampsia!
14lb.
Gulp!
My mate is in her 6th month. She is 5'1" and looks full term. The midwife has sent her for growth scans as the bub is so big, 3lb10oz approx. at the mo! I shall not show her this as she is already panicked! Her dd arrived 5 weeks early weighing a tremendous 8lb7oz! Makes me cross my legs just thinking about it!