Two Tests both BFN?

Kristina

I ovulated on the 12th of April. Had some sharp uterine cramps on the 19th. Took a test on the 20th which was that one. It might have been an evap as im only on 8dpo. This measure 50 hcg levels. This morning i run out of those 50 sensitivity hcg tests so took a normal one (to be taken on the first day od missed period).

I should be 10dpo. I saw a shadow. But im doubting myself, its probably an evap line or something. Any thoughts?