Menstruation always comes after ovulation. Vaginal bleeding without ovulation is not menstruation at all, but is called but spotting, or metrorrhagia. Menstrual periods without ovulation are usually irregular. Sometimes spotting can occur regularly every month, but the bleedings are not termed "menstruations" but are called "false menstruations", or pseudomenstruations. One of the manifestations of Polycystic ovarian syndrome (PCOS) is lack of ovulation and irregular cycles. Metformin is used for treating PCOS. PCOS is endocrine disorder with an unknown reason.
In your case, getting your period after taking metformin doesn’t mean that you have experienced ovulation. Ovulation can be proven in a few ways:
1. by measuring the body temperature-several hours after ovulation, the body temperature increases for a little;
2. by using ovulation predictor kits (OPK)-several hours before ovulation, Luteinisating hormone (LH) level peaks can be registered by the OPK, and
3. detecting the hormone progesterone in the second phase of the cycle; after ovulation, the ovulated follicle turns into a yellow body that produces progesterone.
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