Welcome to HCM,
Merina IUD is a levonorgestrel
releasing intrauterine system.
The cause of your lower abdominal pain
seems to be PID.
Pain during intercourse
can occur due to PID &/or vaginitis
Physical examination and USG of lower abdomen are required.
You shouldn't take it lightly. Please consult a Gynecologist at your earliest.
Due to hormonal
effect it can prevent ovulation in some women.
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Hope you found my response to your query informative and helpful.
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With good wishes,