Can breastfeeding cause irregular cycles?

My son is 6 months old. I breast feed and have recently introduced solids. despite EBF, I got my period again 2 months PP and it came like clockwork for 2 cycles (28days).. the 3rd cycle was late by a few days but eventually came. This cycle i am now 5 days late and Im curious as to whether breastfeeding has anything to do with my cycles all of a sudden becoming irregular. I know i should test but the fact that i was late last month has got me thinking that my cycle is probably all messed up. Has anyone else had a normal period after giving birth an then it all of a sudden become irregular?