Faint positive to Indent

I took a frer test with FMU and I waited 3 minutes( longest 3 minutes ever!). It looked like a very faint line, the level of faint that isn't easily recognizable for another week now probably. To be sure I wasn't seeing what I want to see I had my husband and sister and in law look also. We all seen the same line. But by the 10 minute mark it just faded away and seemed like an indent line. It had lost it pink shading 😢 I have wanted this for so long. Has anyone else experienced this and still gotten their positive later?