bleeding every two weeks and trying to conceive

I wqas under a lot of stress with work recently and began having periods every two weeks. At first they were like spotting in between periods and now they have become heavy periods every two weeks. The undue stress I was under is over and I feel good otherwise but can't get the bleeding to be regular. I have always had regular periods, have had one baby and one miscarriage. I had one depo shot last year in July and none since. My husband and I are trying to conceive so I need help!