
23 days is very early to confirm pregnancy on an ultrasound ~ which pressumably is why nothing was found.
In my opinion palpation is inconclusive.
The x-ray has now been done, so no point worrying over it now. Personally I wouldn't want to x-ray a bitch to confirm pregnancy as I'd only use ultrasound, although I do know of several bitches that have been x-rayed during pregnancy (for all sorts of reasons) & always been fine. I'm sure your girl will be ok. :)