Missed heat cycle
Enlarged or pinker nipples
Slight weight gain
Increased appetite or decreased appetite
More tired than usual
Nesting behavior
Mild abdominal enlargement
Clear vaginal discharge
More affectionate or clingy behavior
Vomiting or morning sickness
Swollen mammary glands
Veterinary confirmation by ultrasound
Veterinary confirmation by palpation
Veterinary confirmation by hormone test
Veterinary confirmation by X-ray later in pregnancy