Is it normal?

I am 12dpo and still getting faint positives. I had blood work done Monday and my hcg was 18 progesterone was greater than 40. I will have a recheck for blood hcg today but my question is, is it normal to still get slightly fainted positives this early in pregnancy seems how my period isn’t due till Saturday? Does the hcg hormone grow stronger after a missed period?

Update: I had my blood redrawn today and it went up to 52. ☺️