Is this too dark for 8DPO??

Rosa

So I was excited but now I'm kinda worried?

I feel like I tested positive too quickly.

I'm basing my ovulation strictly from the apps prediction though because I wasn't tracking my ovulation

But the first day of my last period was December 14th.

This was "4DPO"

And this was 4 days later at maybe 8DPO

Is this normal??