Menstrual cycle

Hey mamas I’m curious how has everyone’s menstrual cycles been since giving birth about a year ago I got mine back in January and ever since then sometimes my cycle is 40 or 20 or 30 or even this month only 13 days long so I’m just curious about everyone else’s experience with there cycle since, I haven’t gone to a doctor yet because I’m feeling they will say well it’s only been a year since we’ve had our babies so give it time