I was just the same from 38 weeks plus, i was a neurotic wreck. I regret it really as I should have relaxed and enjoyed my time on my own, you can never recappture that as if you have no2 you'll be so busy with no1 you won't have this precious time again.
I would also say enjoy it just you and the baby at the mo and you don't have to share as I was surprised how I wasn't keen to share DD with many other people that DH and my Mum!
And ditto all things said about doing things while you still can;
Sleep, Go out with nothing but you and your handbag and not a huge rucksack full of stuff, clean if you can be bothered, cook lots to freeze, stock the cupboards, read, go out in the evening, swim.
Try not to worry about the birth, and i don't know if you've done a birth plan - i didn't and was glad in the end as when it came down to it I couldn't have the water birth I wanted as my waters broke early and despite saying I was having no pain relief I couldn't get the pethidine quick enough! Not all first babies are late DD arrived 1 day late (thought she was going to be three days early - as I said my waters broke early and nothing happened - I elected to be induced after 3 days - they would have anyway at 4) 
I don't know how long they let you go over I thought it was 10-14 days something like that.