Oooh exciting! I've just recently had the same.
I took a rucksack with toiletries bag containing light make up, minitures for showering, deo, toothbrush, femfresh wipes.
Travel hairdryer + straighteners.
Clean top, knickers and socks.
Tiny little slip to wear for bed/the morning.
The slip has only been worn when we went to make coffee downstairs.
The shower/hair stuff hasn't been used during either stay, as we were otherwise occupied for so long, there was no time to shower before i had to leave.
My wobbly belly was forgotten about by me very quickly as he was clearly enjoying himself and enjoying me AND my wobbly belly. Hence I didn't bother putting on my slip whenever I popped to the loo.
Have a wonderful time.