Day 48. Of what was supposed to only be a 38 day cycle...

Omg!! What is happening to me. Today is day 48. And idk what's going on. AF Still hasn't shown up and it's driving me crazy. My cycle is usually a 36-38 day cycle. I took a dollar tree pregnancy test when I was 4 days late. And it came up negitive. I'm to scared to test again. But so many symptoms point to maybe being pregnant.