decreased menstrual flow

nanganak ako Sept 14, nagkaron agad ako katapusan ng october, then 2nd week ng November, tapos last week ng Dec na ulit, tapos January hindi ako dinatnan, ngayong February meron ulit, since feb 9 pero mahina lang (hindi sya spotting kasi red talaga) question, normal po ba to sa pure breastfeed? o need ko na magpacheck up??