I saw your post in the middle of the night, and wondered if you had managed to get rid of the contractions. Just preparation, I guess, huh?
Lying down is a good thing! And don't struggle too hard to put the groceries away. You have enough little helpers...enlist them.
The contractions stopped last night when I moved around and had a glass of wine. This has happened in other pregnancies - I go into a panic, and then it just ... stops :-).
I don't put groceries away - that's definitely one that gets delegated. Then when they can't find things, I sit on my duff and say, "Why, that's funny - you put it away, didn't you?"