I'm 28 weeks in my 2nd pregnancy and since 20 weeks have had an obvious bump. Last week even got told by my midwife I looked huge for how far I was and was measuring 2 weeks ahead this morning I don't have a bump at all! It's gone?! I don't understand :/ I know baby can change position but would a change of position really make such a huge difference to my physical appearance bump wise? I'm a bit worried