PPD or PMS?

Hey ladies! Since giving birth 6 weeks ago I’ve watched myself closely for PPD as I’ve had depression in the past and I know that can raise your likelihood. Up until today, things have been great. However, today seems to have been the worst day possible. Nothing went right and I started my period even though I EBF. Everything either upset me or made me want to cry. I feel completely helpless and I’m wondering if this is just normal PMS feelings or if it’s the beginning of PPD? My cycles before I got pregnant were super irregular so I don’t remember if this is normal or not.