I’m confused I need help!

I was supposed to get my period this past Tuesday, so Tuesday and Wednesday the only thing I saw on my tampon was a single line of brownish discharge, Thursday Friday and today I only had a very little amount of blood on my tampon. All week I’ve been nauseous and dizzy off and on and fatigued. I also have a weird pressure feeling in my abdomen, no cramps but just a feeling that makes me more aware of my abdomen of that makes sense. I’ve been late before on my period but never have I had such a light period in my life. I can barley even count this as a period because the tampons come out so dry it hurts. Could I be pregnant?