Nausea with first postpartum period (15 months PP)

I just got my period for the first time at 15 months postpartum. I’m still breastfeeding once or twice a day and have been breastfeeding on this schedule for the last 3 months.

I just got my period two days ago and have been feeling nauseous all day the past few days. It feels worse when I eat.

I don’t think it has to do with the breastfeeding because like I said I’ve been nursing only twice a day for the last few months. The nausea only started when my period started.

Did anyone else get nausea with your first postpartum period? Especially if you got it back 6 or more months after delivery?