Welp, here's day 9. There's a very faint line still. At first I wasn't sure if it was just an evap or HCG, but as the test dries, you can see that there was color. So I'm fairly certain it's still the HCG in my system.
My sports bra is back on! I took it off yesterday to take a shower, we went out and I wore a regular bra, took that off once we were home, and felt fine. My boobs weren't really sore anymore, so didn't think anything of it when I went to bed.
Every single time I turned, I woke up b/c my boobs were killing me! I finally had enough and got back up to put my sports bra back on (I need to find my other ones). And my boobs instantly felt better.