Bleeding or spotting in the first trimester

Miscarriage. Pre-miscarriage bleeding or spotting is common in almost all women who miscarry.
Ectopic pregnancy is a term that refers to a pregnancy that occurs when a fertilized egg leaves the uterus and begins to grow outside of it. An ectopic pregnancy will not result in a baby being born. It can produce major, life-threatening complications for a pregnant woman.
Molar pregnancy. This occurs when a mass of tissue grows inside the womb instead of a baby. Molar pregnancy is a rare occurrence.
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