Second period after birth…late

Danielle

Hi- my baby is 12 weeks old and I got my first period around 8 weeks after delivery. I was due to get my period 4 days ago but haven’t yet. I tested Sunday and it said negative but I feel nauseous and dizzy, I’ve felt period cramps for over a week but want to know has this happened to anyone else and then they got their period? Hoping irregular periods after birth are common! 🙏🏼