How to tell if its spotting or just my period coming?

Stormy

For the last two weeks I have had very faint blood on the toilet paper when I wipe after using the bathroom. However, the blood is never on my underwear or anything its only when I wipe. Does that mean I'm in early pregnancy or just my period coming soon. Also I've never been pregnant before and I just turned 22 and can't really talk to anyone about this so I'd like some help. My period is now only 2 days away. Thanks!