Chemical?? Sorry some tmi

I feel crazy. So after faint positive lines some of you maybe saw on other posts, I now have this. AF is due 4/16. Had one tiny light pink spotting last week, then brown spotting yesterday morning and a little last night. (This test was taken last night before I noticed more spotting) today AF arrived, or so I think. A couple good size clots and cramps. I only had 1 tampon at work. I worked 10 hours before coming home to change it (yeah that sucked) but it was about 1/2 and 1/2 brown/red blood?? Help. This is stressing me out! I'm 13dpo today. ​