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If your pet needs any tests, your vet will let you know. If she has parasites, your vet will treat them. During your visit, your vet can use ultrasound to see the growing puppies as early as 3 weeks in. Ultrasound is safe during pregnancy. It uses sound waves to create an image of your dog's womb. The vet may give your dog a blood test to check her hormone levels. Dogs have higher levels of a hormone called relaxin when they're pregnant.
Stages and Dog Pregnancy Timeline. Month 1: Dog Fetus: Days 1 through 4: Pregnancy starts when the dog ovulates, which is called the data of whelping. Dog sperm will reach an ovum on day 4 (48 to 73 hours). Day 7: Embryos will move to the uterine horns. Day 16: Dog embryos embed in the uterus lining.