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If the symptoms occur during midcycle time, they could be due to ovulation, also known as Mittelschmerz. It is usually felt as one sided severe pain around ovulation time. It is believed to be caused by the ovarian capsule stretching by the growing egg follicle before rupture, or due to the fluid/blood released during rupture causing the irritation & inflammation of surrounding structures resulting in pain. The confirmation is usually done by ultrasound scan confirming cyst/follicle rupture. Pain relievers started (around ovulation time) helps to control the symptoms. It can be used as indication to monitor ovulation and time your intercourse (if planning for pregnancy). If you are not planning for pregnancy, use of hormonal contraceptives (to prevent ovulation) would be helpful in controlling symptoms. Visit your doctor/gynecologist for further clarification and assistance.
Another possibility includes deep endometriosis and their growth causing eth pain along with pain during urination and bowel movements (depending on the location of the endometriosis implants). Visit your doctor/gynecologist for thorough evaluation to look for the underlying cause. Discuss your pregnancy plans and proceed with further treatment options as suggested based on examination findings and investigations results. Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Take adequate rest. Drink plenty of water. Maintain healthy diet and lifestyle.
Take care.