Hcg levels

Found out I was pregnant on the 19th, on the 20th I got blood drawn for hcg levels and progesterone levels. The results, she said, we're good. Hcg at 250 and progesterone at 44.6.

Had more blood drawn on the 22nd and the results, she said, we're great. Hcg at 783 and progesterone at 84.7.

These seem so low to me... but they say they are good numbers. I feel like the low numbers could mean a later miscarriage like my first one at 8 weeks vs my last one at right around this time, 4-5 weeks.

Words of wisdom anyone?