Having two periods in one month is not a sign of pregnancy. However, implantation bleeding can sometimes be mistaken for a period. This bleeding is usually lighter than menstrual bleeding and may appear as just a few drops of blood on the underwear, typically 7 to 14 days after sexual intercourse.
If pregnancy is suspected, other early symptoms may include nausea or vomiting, breast tenderness, frequent urination, and fatigue.
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Possible causes of two periods in one month include excessive stress, rapid weight changes, intense physical activity, certain medications such as birth control, and hormonal changes.
Gynecological conditions, including uterine fibroids and polyendocrine metabolic ovarian syndrome (PMOS), can also cause more frequent bleeding. Having two periods in one month is also more common at the beginning or end of the reproductive years and does not always indicate a serious problem.