I allow my bitch to run around when she is expecting a litter, by the last week she starts to move more slowly, I was told by everybody to stop riding my bike when I was pregnant, on checking with my doctor, he said it was rubbish, that you should continue to do what you had done before.

However i do agree that if she is running off to keep her on a lead or line when out for a walk.

Good luck with your pups, I hope all goes well.