Yes I think with my first daughter it wasn't a perfect doubling...and that was fine. TBH after a couple of initial draws I stop getting them done as it's stressful and there's sweet FA you can do about it.

I know that's easier said than done!! Also in my experience, medical staff don't tend to be overly optimistic in general about HCG results, even if they're fine lol. A scan will def tell you how things are progressing, and I'm sure it's fine.