12w no US how long does insurance take?

Savannah • Pregnant with my first baby due Nov. 20 😊
So I'm 12 weeks along. I've misscarried before and I haven't had one US yet. My dr. Is waiting for an approval from my insurance (blue cross) for an US. It's been a week. I'm just anxious. How long did you have to wait for your insurance for an approval? If you had to