Help needed

I am a little over 7 months pp and wanting to ttc soon. I got my period back at 2 months pp and it was a 3day bleed on an 11 day cycle. I thought it was just because of breast feeding and just getting it back that was just needing time to adjust. But now that I am 7 months pp and and my periods are about the same but still off (Meaning a 7 day bleed on an 18 day cycle with 3 days of spotting before my bleed). I have an appointment scheduled with my ob coming up on the 7th, but I'm looking to see if anyone has had this problem before.