Periods too close

Since having my 3rd child November of 2014, and having my tubes tied.....my periods are insane. I had my period 21 days ago and it has blessed me again this morning! I've spoke with my primary care who doesn't really have an answer as to why I continue having irregular periods. To note, I don't always have them this close together. But it's happened more times than not. Anybody have this issue after a tubal?