What hormone causes amenorrhea? Progesterone 2. What is one of the first signs of pregnancy? Urinary frequency 3. What causes breast tenderness? Excess hormones 4. What are probable signs of pregnancy? A positive pregnancy test Goodell' sign Chadwick's sign Hegar's sign Uterine enlargement Braxton hicks contractions Pigmentation/changes of skin 5. What is a positive pregnancy test based on? 6. What other conditions can produce positive hCG levels? hCG levels hydatiform mole drugs 7. What is Goodell's sign? Softening of cervix in the second month of pregnancy 8. What is Chadwick's sign? Bluish color of vaginal mucosa and cervix at 4 weeks