Hi, I too was surprised when I got my period, my LO was 3 months old (only just stopped bleeding after the birth!). I too exclusively breastfed (until recently when we started weaning) every 3-4 hours... My LO is now 7 months old (we are still breastfeeding) and so I have now had 4 periods - the first 2 were strong and long, now back to normal although the gaps between them are longer than before (now 30-35 days, before 28 days spot on)