Next ultrasound?

Wondering if anyone has any input for me - I'm a ftm in the US and have very good health insurance. I'm almost 28 weeks now and my next OB appointment is next week. I have had something like 8 ultrasounds so far but have not had one since the anatomy scan at 20 weeks. Two months later and not seeing my little bean has me a little worried - especially because her movement over the past few days has been a little quieter than usual. Does anyone know when I might have another ultrasound?