I need some girly advice! What do you do in this situation?

I never know when my period is, it skips weeks and is all over the month. Most of the time I think I'm pregnant, because my husband thinks birth control is unhealthy and he'd rather use condoms. When I did use birth control it was on the same week every time, now I don't know. What can I do to get my period regular other than birth control?
I need some girly advice! What do you do in this situation?
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