Should I test?

Mary • Stepmomma. Vegetarian and animal lover. Unexplained infertility.
I should've started my period on Sunday (5/15) but only had very light occasional brown spotting (like what you have when your period is done) off and on Sunday and Monday. Tuesday morning when I woke up I started and it was a heavy flow all day. Wednesday was heavy-medium and yesterday was medium in the morning and then very light. Today has been very light. 
Normally I'm pretty regular and I have a weeklong flow that is heavy for a few days, medium for a few days, and light for a few days. Should I take a test, or is it probably just my body deregulating after being off the pull for a few years?