How long would it take to regulate my periods?

I’ve switched bc three times this year. I had the pills and then switched to another brand of pills and now I’m on the patch. Planned parent hood gave me a years worth of patches so that’s good. Sometimes I don’t get a period for 2 months and I take a pregnancy test every week. It’s always negative. I’m always on time with my bc. And sometimes my “period” is a few spots of brown blood. It’s so stressful. I can’t handle another baby right now