Signs of Pregnancy
There are three categories of pregnancy signs: possible, probable, and positive. Here is a chart listing the signs and their category.
Sign
Category  
No period
Possible
Just "feeling" pregnant
Possible
Nasuea and Vomiting
Possible
Soreness of the Breasts
Possible
Enlargement of the Breasts
Possible
Increased Urination
Possible
Fatigue
Possible
Ptyalism (Excessive salivation)
Possible
Montgomery's Tubercules
Possible
Stretch Marks
Possible
Spider Veins
Possible
Quickening (Fetal Movement)
Possible
Chadwick's Sign (Bluish tinge to the vagina and cervix)
Possible
Colostrum from Breasts
Possible
Enlarged Abdomen
Probable
Positive Pregnancy Test
Probable
Change in uterine shape
Probable
Softening of the Cervix (Goodell's Sign)
Probable
Enlarging Uterus
Probable
Braxton Hicks Contractions
Probable
Palpation of the Baby
Probable
Ballottement
Probable
Fetal Heart Tones
Positive
Sonography Detection
Positive
X-ray Detection
Positive
Other Resources:
Quiz: Am I Pregnant?
Pregnancy Tests
25 Signs of Pregnancy from About.com
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