Before then -- it's not unusual for the vulva to remain slightly enlarged if a bitch is pregnant. And many times their nipples will stay a little pink. These signes may be more pronounced with a bitch that has previously had a litter. Pregnant girls can have morning sickness or try to throw up by eating grass. Many times they will have a personality change and become extremely lovable.
As for your vet -- many can palpate puppies around 28 days from conception.
This does take some skill and not all vets are good at it. And it is
definitely something you should try on your own as it can rupture the
uterus. If your vet is equiped with ultrasound or can referyou to someone
that has one -- this is usually quite good. Puppies can be seen by ultra
sound from around 30 days onward. After about 45 days when the puppies have
calicified they can also be picked up by conventioanl X-ray.
Bobbie Linden - Bhe Jei Maltese