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Spotting in early pregnancy is fairly common, but it should never be considered normal, and it always warrants a call to your ob-gyn, Dr. Landy says. Although the presence of spotting does not always indicate a miscarriage, it is a sign that something abnormal may be going on in the pregnancy, she adds.
Brown spotting occurs most frequently during the first trimester. In fact, it can even occur before you know you are pregnant. Implantation bleeding, when the fertilized egg attaches to the uterine lining, is a common cause of brown spotting and usually occurs before a women even takes a pregnancy test.