So many ultrasounds

Alicia • Momma in the making. Mono/di 🎀twin girls 🎀due Dec 2018💕
I am booked in for my third ultrasound in that many months, this week. 
Is anyone else getting sent for this many? I have had some spotting and an infection I just finished the treatment my doctor prescribed. But I got the impression from the diagnostic office they think it's ridiculous I've been there so many times for being at the most 12+ weeks. The scans came back normal. Just 8 days behind where my cycle dated me at. 
I'm trying to pass it off as extra due diligence and ignore the stressed out receptionist at the ultrasound clinic. I can't not go if my doctor wants to see another scan. But I'm starting to feel worried something going very wrong and my doctor hasn't told me. 
Any other moms out there ever have this many ultrasounds so early on?