Why are they not getting darker

Sjs314 • 👧🏼girl #1 6.8.14 👧🏼girl #2 12.8.15! 👼🏻Miscarriage 6.8.18 🌈 👶🏼 Due March ‘19

Over the past week, using FRER, I have just got vvfl‘s and they simply are not getting much darker! It’s kind of sad and I don’t know how to feel about it. I have two kids already, my tell tale sign is super tender breast because it’s not a pms symptom for me. I just don’t get it! Do you guys see the line? This is at the 8 minute mark and it’s pink in person!