Am I losing this pregnancy / chemical pregnancy ?

I am 13dpo today and took another test today - my line isn't any darker. This morning I started to have some dark brown discharge , some of it has small clots (no red as of yet) I have doctor booked for Tuesday but I am freaking out with the line not darkening and the discharge! Anyone have this and go on to have a normal pregnancy? I have also been waking up to wee all the time for the last few nights, then last night, nothing. I am so anxious after I finally thought this one would stick 😢😖