irregular period postpartum

Averi
Hi ladies.
So I had my lo last July via c-section, and did not breastfeed. My period returned 6 weeks later, and fell back into my regular cycle of every 28-29 days.
Well, the past two months, it's been extremely irregular, which has never happened. Last month was 34 days, and this month will be 35 days tomorrow. Is it possible that my hormones are just still out of whack from pregnancy? I would have figured it would have leveled out already, since my first few cycles were normal.
Anyone experience this?
Thanks!