Is it normal to wait 10+ weeks for another ultrasound?

Madison💁🏼‍♀️ • Retailer// Married 6 yrs// Mommy to fraternal twin girls// surprise baby on the way!
I had my last ultrasound at 8 weeks, 2 days. Doc doesn't want another until I'm about 20 weeks. My friend who just had twins said her doc ordered them biweekly when they discovered it wasn't a singleton pregnancy (this was at 9weeks). I was just curious what y'all thought. 
I'm just going to take it as this meaning that he is confident that everything is just fine ? ha. 
Thoughts?

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