does my bipolar cycle imitate a menstrual cycle?

Okay so I was talking to a friend last night about my current bout of depression, and she, because she likes to tease me about how girly I am, pointed out that my bipolar cycle speeds up once a month, mimicking a period.

Now before you totally dismiss this, I must report that both times I lived with a woman with a menstrual cycle, my bipolar started to mirror that cycle, to the point I would joke with Tracy that she never had to tell me when her period was about to start, as I just had to pay attention to my own emotions.

Now is there anything scientific to the idea beyond that fact?

Heck if I know.

Be kind of funny if it was the case, though.