I see a vvvfl bit mine was like that I had to hold it up to the light 2 I thought I was trippen confirmed 2 days later at doc but I was like 4 weeks maby less I MC after tho with my first it was dark that was a FR but I was 6 weeks when I found out my 2nd was this one I used a cheap one . Then the 3rd it was so dark on a FR it showed up in one sec then at docs it came up light I was 5 weeks I love FR