Positive First Response Gold Digital & 19 hcg Yesterday

Kendal

Yesteryday I got a faint line on a First Response pregnancy test as well as a + on a First Response Gold Digital. Then I went in to my OB's office and got bloodwork. My hcg was at 19.

it had been 4 weeks and 3 days since my last period (2 days late). Shouldn't my hcg be higher?