Period, spotting, now no period?

I had my daughter in October and by mid/late November I had a week long period. I'd recently started my birth control (Norlyda) before the period, had spotting until late March, and nothing for three months now. I'm definitely not pregnant, I am breastfeeing and pumping, and I'm 21. Anyone else have this happen to them? Was it just the birth control leveling my hormones out after giving birth?