brown spotting instead of AF

So I'm having an issue- brown spotting. This has NEVER happened to me before. My period was supposed to start today (feb. 7) and all I'm getting is brown. AF is almost always on time and shows up FULL FORCE, cramps and bleeding through the sheets! My boobs have been way more sore than usual, there were a couple days where I couldn't even bring myself to put on a bra. My nipples hurt as well, which hasn't ever happened before.
Should I head to CVS for a test?