Help: I’ve been spotting blood for 17 days, missed my period

So my period didn’t exactly come this month, as in, it was almost not there: I was spotting instead of free bleeding. However it didn’t end: I’m on day 17 of my cycle and still spotting blood.

My breasts are small so I don’t think I’m pregnant, but I’ve been very stressed recently and slept little (when I sleep less than 5 hours my period doesn’t come that month). So I think the stress is related.

Is this a serious problem? Should I see a gynecologist? Or is it just related to stress?