Breastfeeding/first postpartum period?

This question is for those who are, or have, exclusively breastfed. When did you get your first period after giving birth? I am exclusively breastfeeding, and do not go longer than 4-5 hours without nursing (usually at night). Otherwise, I nurse every 1.5-3 hours throughout the day. I am 2 months postpartum. I'm wondering if some spotting I had a couple of weeks ago was a period (lasted about 4 days) or if it was some postpartum bleeding that had returned briefly.