To test or not to test...

I'm 13dpo and expecting AF tomorrow or possibly Friday. I was planning on testing tomorrow morning if she hadn't shown. This morning I noticed some light pink spotting when I wiped..I assumed it was AF starting, even though she normally starts out with warning cramps and brown spotting in the afternoon. I put on a liner and went about with my day...and the next time I went to the bathroom a few hours later, there was nothing on the liner or when I wiped. Now I can't decide if I should still test tomorrow, or wait a little longer..what do you ladies think?