I got my first positive on a FRER about 9 days ago. I took a couple more last week and lines were getting darker. Yesterday I started spotting a little. I have low progesterone and am on prometrium, but as of last week HCG was doubling as it should. Today I took another FRER because I'm paranoid, and the line is still dark, but it's skinnier than the last 2 I took. Has anyone else had this happen? My last pregnancy ended in an mc, so now I'm paranoid. I know they say the tests are just qualitative, but it seems like everyone's lines do get lighter if HCG starts dropping.