Breast soreness is one of the earliest signs of pregnancy. If you're breasts are not sore, however, and you're concerned about miscarriage, it's also something that's very easy to overanalyze.
Having no or fleeting breast soreness in early pregnancy does not mean anything; it should not be interpreted as a sign of miscarriage or any other complication.
Every woman responds to pregnancy differently. Some will have every symptom in the book, others will have a few, and still others may have fluctuating symptoms or no symptoms at all in the early stages. Try not to worry too much about your early pregnancy symptoms; neither breast soreness nor any other early pregnancy symptom is a reliable indicator of how your pregnancy is progressing.
Source:
American Pregnancy Association, "Breast Changes During Pregnancy." Mar 2007. Accessed 1 Dec 2008.
