Ob-Gyn questions? Ask a gynecologist online.
the hormonal cycle can be influenced by many things, even stress or climate changes can play a role. So changes of period like this are a common problem. I would recommend the use of monk´s pepper (Vitex agnus-castus, over the counter at pharmacy) which has a cycle regulating effect.
Dr. N. Scheufele
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Thanks a lot, all the best for you.