What are miscarriage chances with good hcg doubling levels?

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Hi ladies, does anyone know what are the miscarriage probability with good doubling hcg levels.m? My doubling time is 40 and 37h but I’m still so anxious for mot having symptoms and for feeling cold instead of hot.

I’m 21 days post IUI.

Beta 15 dpiui 122

Beta 18 dpiui 421

Beta 20 dpiui 1036.

My ultrasound is not for 12 days and I am constantly anxious! Help me please! 🙏🏻