Should I test or wait?

I'm 33 and we've been trying to conceive for 6 months now. AF should have been here 1/3. I started having dark brown spotting on 1/5. Do I consider this my period or am I still late? Should I test or wait a few more days? My periods are typically very light, only need a panty liner, and usually only last 36-48 hours. ugh....