Endometrial Lining 14mm ?

Isn't that kinda of thick to be 8dpo? Also has a blood test today and it's negative 😞 so I'm sure I'm out! Maybe the 14mm Endometrial Lining is because AF is going to be arriving soon!
There's no way I could still be in the running this round if blood work at 8dpo was 1hcg right?