Spotting

Hi girls! For the first time, I've been seeing some blood spottings. It has been going on for a few days now. eve says its time for my period but another app that I've been using for years says I have 11 more days until my period. My usual periods are heavy but I have been seeing less and less of it but this time I know something is off.

I don't have the time or money to go see a Gynecologist. Any idea what might be causing it?

I don't have a partner so I'm not sexually active. I haven't been doing anything different either.