Worried?

Me

So I have had two ultrasounds in my pregnancy. I'm only 10 weeks along and I'm having another one on 4/12/18. My friend goes to the same doctor I go to and she only has had 3 ultrasounds throughout her whole pregnancy. She's 25 weeks. I've been getting scheduled to go in every month for an ultrasound. Is there a reason why? Should I be worried?