Hcg question

So I found out super early that I was pregnant. 3 weeks to be exact. My first hcg was 24.9 and second was 72.2. I know its a good thing that it doubled but why did it more than double. Of course I googled 😬😬 im just concerned since we did have a eptopic (which my numbers doible so not so worried) but we also had an empty sac(molar pregnancy) we do have a set of faternal twins also. I think im just over thinking 🤔 im waiting on my dr to respond btw.

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