Period different after c section?

I had an unplanned but not emergency c section in September. Got on combo pill at my 6 week appt. I’d been on the pill 10 years prior and always experienced a “period” during the sugar pill week (cramps, bleeding). I know it’s not a true period but I always had bleeding and symptoms. Now post c section around the sugar pill time I have the strangest pain. It’s not like cramps at all. It’s more like a shooting or stabbing pain on either side of my uterus but mostly my left side. I also found out I have a small isthmocele so I don’t know if that is a contributing factor. Anyone else have this experience ?