Nervous, low hcg

Hoping to hear some positive stories! I had a chemical pregnancy last month so I’m pretty anxious.

This cycle, I’m not exactly sure when I ovulated, I would guess I’m anywhere between 11-14 DPO.

I’ve had positive tests at home, line is getting darker.

Had first HCG drawn on the day I should’ve seen AF, result came back at 19.

I know it’s more important if it doubles in the next 48-72 hours, but just concerned it’s too low to start.