I recently went through this also. Our pups are 5 weeks now, but when mom was 4-5 weeks into gestation, she slowed down her eating. She has been a picky eater at times before, and we were trying new food during this pregnancy, so I just tried leaving her the usual kibble during the day. I did find she would eat the canned version, so I gave her some of that too, and some meat scraps as were available. So basically she skipped a few meals, but eventually got back to her usual diet. At the time I did come across a passage in one of my books that mentioned they will sometimes do this at that time frame. I had a friend who would have to take her dog to McD's for hamburgers, cause she wouldn't eat anything else while pregnant.