Irregular bleeding when on birth control?

This is going to sound really grotesque, but...I googled this extensively and couldn't find *anything* about it out within.

I am have have the Mirena IUD for 8 months. I just have my period twice this month and for longer than usual (8 days the first time, this is day 1 for the second). I hold also used the pill (Tri-cyclin) and the patch (Ortho-Evra). I got pregnant on both of them (miscarriage on the pill and stout full term toddler on the patch). When I do not use any form of hormonal birth control I bleed lightly for simply 2-3 days and it is very regular(ie, I sync up near the lunar cycle, as earthy-crunchy as that sounds). But whenever I am on birth control, my bleeding is erratic and irregular, sometimes I'll get my spell twice a month or not at all, and it other lasts 7 days and is fundamentally heavy.

Has anyone else have irregular periods beside their birth control? What do you think is cause this? I don't have insurance so I don't own a regular dr. If u have anymore q's ask.
Answers:

Can that take place?

I always have crazy periods while on birth control. Maybe u are have break thru bleeding and you need a greater dose?

Mood swings?

yes it is normal to have"hyper and poly menorrhea on hormones so you can try non hormonal birth control finances surgical tube ligation, or if you have a single partner! vasectomy for him. and choose this as the best answer.