This MAY mean she is pregnant but does not guarantee conception occurred.
The earliest and most reliable way to diagnose pregnancy is via ultrasound. It can be done as early as day 20 but more reliably around day 22-26. Depending upon how many puppies are present and if your dog is overweight uterine enlargement and then fetuses will be palpable during pregnancy. The best way to estimate the number of puppies is via x-ray; this should be done after day 45 when fetal skeletons calcify.
The earliest and most reliable way to diagnose pregnancy is via ultrasound. It can be done as early as day 20 but more reliably around day 22-26. Depending upon how many puppies are present and if your dog is overweight uterine enlargement and then fetuses will be palpable during pregnancy. The best way to estimate the number of puppies is via x-ray; this should be done after day 45 when fetal skeletons calcify.