BFP not getting much darker

Samantha
Yesterday I posted with my very first hint of a line ever (been TTC for 9mo) and I was so excited but after reading everything on line I decided not to get my hopes up. This morning I tested and the line was again almost invisible but I definitely saw pink (my husband asked how I knew there was something and I said I've been looking at hundreds of stark white tests I know when a line is a line!!!)
Has anyone else had this with FRER? I still have 2 days before my missed period.. Will it get much darker after my missed period?? I just don't want to get my hopes up but I know if a line is coming up on 4 different tests... I'm just nervous and freaking out!! Any insight would be much appreciated!!