We had a moving date for 7 April and was all geared up as am finishing work on 5 April, moving and then baby due at end of April.
Selllers have just come back and said there are problems with their mortgage so they need to delay and end of April, start of May is looking more likely... just as I'm going into labour... 
Have responded asking them to try and sort it out before end of April but they're saying 10 MAy more likely when am likely to have a very tiny baby.
Just very annoying, apart from anything else it now means i have 3 weeks pre-baby kicking my heels in old place when I should have been nesting in new place.