Spotting once every other day

Olivia
I've never messed up my birth control before but this month (idk why) I missed one the first week and 2 the 2nd week. I've been spotting every other day and it's light in color and only happens for a few short minutes then goes away.  It's really weird. Is it just because I missed a few pills causing it to do that? Or what could it be?