Vvfl on frer at 13 dpo. Help!!

Natalie

Need some support. Been trying for 15 months. I usually have 3-4 days of brown spotting before af. I am one day away from af so I took a frer, and it showed a vvvfl within 3 minutes!!!I have never seen a line ever!! I was originally so excited, but I am worried that the line should be much darker by this point. Anyone have a vvvfl with a frer at 13 dpo and have a successful pregnancy?