Anxious

My period is due on Friday and all day today I have been dizzy, shakey and getting these huge waves of anxiousness. I get butterflies in my stomach and for some weird reason feel extremely nervous. I have had a gut feeling that I am pregnant as I have been having light cramping and severe fatigue and increased appetite (waking up in the middle of night STARVING) since around 8/9 dpo. Has anyone ever experienced this and is it a sign of pregnancy? I don't normally ever feel this way so it's weird to me.