Chemical?

Yesterday I took a test and it was positive which shocked me because I had what seemed like a normal heavy period at least for the first 2 days. It then went straight to brown spotting for 2 days.

I took another test a little bit after and it was still positive but fainter. I also took a FRER and it was neg.

This morning I took 6 more tests... one FRER rapid cause it was the last FRER I had along with one cheapie. When they both came up what I assumed was neg I took four more cheapies and all looked neg. I dont have a picture cause I got upset and threw them away. I really dont know what to do at this point... I was so excited and then I watched my line fade away.