Translation of "Menstrual" in Japanese

My menstrual cycle is irregular.

生理が不規則です。

- My menstrual cramps have been horrible lately.
- Recently, my menstrual cramps have been severe.

最近生理痛がひどいんだ。

My menstrual cramps have been horrible lately.

最近生理痛がひどいんだ。

My menstrual cycle is about every four weeks.

月経周期は約４週間です。