How do you know when it’s a chemical pregnancy VS not?

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10 DPO

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A chemical pregnancy is when you get a positive pregnancy test and then they progressively get lighter until AF starts. This test is clearly positive. If you test again in a couple of days and it's darker, you'll most likely be fine.

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A chemical pregnancy is defined as a pregnancy not confirmed by ultrasound. So basically all (with the exception of some) miscarriages before 8 weeks are considered a chemical pregnancy.

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That's pretty dark. with my chemical last cycle I got 16 positive on line test but never got one with a digital. then started bleeding a week after AF

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thats darker at 10dpo than my chemical was at 14 dpo. keep testing and if it doesnt progressivly get lighter than dont worry:)

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Have you had any bleeding? I had one 6 months ago and I started spotting, had the worst cramps of my life and huge clots.

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A chemical pregnancy is simply that.  The fertilized egg is defective therefore doesn’t develop into an embryo.  The embryo and the developmental process is what creates the hormones to sustain the pregnancy however since the egg doesn’t develop the hormones don’t get high enough to maintain the pregnancy longer than when your period is going to start.  When you have a chemical your period starts around the usual time and it’s unlikely that you caught it with a pregnancy test unless you’re a habitual tester like i was.  Any pregnancy that is confirmed via blood test would be considered a miscarriage because the hormone levels were high enough to establish the pregnancy existed.    
I’ve had 3 chemical pregnancies all in one year and back to back.  I caught them all on a pregnancy test and watched my very faint lines get lighter each time.

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sorry to say but this was my test last december and I had a cp.

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I'd say those are pretty positive. I can see the positive in the back test without zooming. Not a Dr but safe to say your expecting :) 
Fingers crossed for you :)