Probably a mix of both. Stress and hormones alot of people don't seem to have periods when they're breastfeeding as its a hormonal thing x
@Olga interesting but also wrong. I breastfed both my babies (one til 4m and the other until 17m) and my period returned 8-9wks pp both times. Incognito it could be that you’re still breastfeeding and stress - especially if stress was known to delay/throw off your period before pregnancy
Like others mentioned it could be a combo of both. My sister only got her period after she dropped all of her day feeds but I got my period 3 months pp even though I was exclusively breastfeeding.. so it can differ quite a bit. If you're concerned just get yourself checked.
@Sharnee that may be true for yourself but breastfeeding is known to stop periods. Some don't get them until they reduce the amount of feeds or completely stop.
If you breastfeed the baby you don't have periods. Once you stop, the period comes back in a couple of months.