Cycle return at 5weeks PP while exclusively breastfeeding?

Ca

I stopped bleeding at about 4 weeks PP after it had been very light bleeding for like 2 weeks.

Then last Wednesday I started bleeding again and it turned into what would be normal period bleeding for me, just without the cramping.

Has anyone got their period back this early even though their breastfeeding? I was expecting it to stay away for quite a while. I had an unplanned csection if that matters.