Low HCG- has anyone had this and been ok?

Kennedy

my lab results:

Beta HCG 1: 139

HCG 2 (5 days later) 387

HCG 3 (6 days after original) 420

So they’re going up, but nothing near the doubling that it’s supposed to.

Should I prepare myself for miscarriage or do the numbers vary so much that mine might be enough to sustain for week 4 of pregnancy? (Today is week 5 day 1)

No OB appointment til August 11 or so and it’s just me and dr Facebook/google and I’m freaking out