confused

I had a positive pregnancy test yesterday with FMU. I freaked out and took a few more which all looked negative (I thought I was only 6dpo but was caught off guard by how dark the line was on the first test) I decided to take another with FMU this morning and it was very very faint.. I haven’t had any cramping, bleeding, etc. just sore boobs and a bit nauseous. I’m just really confused on what’s going on. Chemical? False positive? I used Pregmate to test. Should I just go get an FRER since they’re supposedly more sensitive?