First trimester · Days 8–14

Week 2 of dog pregnancy: embryos travel to the uterus

The embryos move into the uterine horns and space themselves out. They are still microscopic.

Updated October 2026 · Information only, not veterinary advice

What you may notice

Avoid any medication, including spot-on flea and tick products, unless your vet says it is safe in pregnancy.

No change. Do not start puppy food or calcium supplements.

Nothing routine this week.

Questions

Can I give flea or worming treatment in week 2?

Only products your vet has confirmed are safe in pregnancy. Many are not, so ask before using any.

Should she have any vaccines now?

Vaccination is best done before breeding. Ask your vet before giving anything during pregnancy.

Keep reading

Enter a date and see her current day, week and what to expect now.

Day-by-day dates for vet visits, X-ray, setup and temperature checks.

What happens, what to feed and when to see the vet, weeks 1 to 9.