FRER indent lines?

Are indent lines usually pink? I had a vvfl show up on a FRER with evening pee (retesting in morning) and it was there within a minute, but after another 5-6 the colour faded slightly. Fiancée and I can both see it without squinting, but since it’s so faint? Can it be an indent line? This would be my 4th pregnancy so I’m familiar with faint positives, but I’ve heard that these tests give out infamous coloured indents? Help? 🙏

My camera sucks with taking pictures of vvfls and it’s out of timeframe now. The more time passes the fainter the line gets?? Is that normal for a positive or normal for an indent? 🙈

Let me know what you think/about indent lines/your experiences please!!

EDIT: I’m 5 months post partum and haven’t gotten my period yet