Once a female has had her first heat cycle...her nipples will no longer be flat against her chest/tummy. Their vulvas do not immediately shrink in swelling either.
At four weeks a vet can palpate or do an ultrasound to confirm a pregnancy but by that time...her teats will have swelling beneath them too.
__________________ Deb, Reese, Reggie, Frazier, Libby, Sidney, & Bodie |