Confused about my period

So I have a question about my period. It's always been really irregular but since summer I'll get it every few weeks sometimes it'll be a month and a half before I'll get it. I've also never dealt with spotting before. Well this is one of those month and a half times and I have been somewhat stressed and have alot of good and bad things happening in my life right now which stress effects it alot. But I've been putting a just in case light tampon in while going to classes and there's been like one really really little spot of blood on it the last few days and have no idea what to think of it.