Irregular periods while breastfeeding ?

My son is 14mo old and still nurses mornings and evenings. My period returned when he was almost 12months old. Since then, I’ve had 4 periods. The second one came about 4 weeks after the first, then the third one came 2 weeks later, and now the fourth one about 3 weeks later.

Is it normal for it to be irregular like this while breastfeeding? Prior to pregnancy, my cycles were usually 30-32 days. The periods are of normal flow, no crazy cramps or anything.