Decreased movement

Anyone else experience alot less movement lately? I am almost 38 weeks. I would call but by 9pm my girl is going crazy. That seems to be the only time she really moves. also today at my appointment my doctor couldn't find her heartbeat so she used the placenta instead and said she was around 120bpm. I know she's fine because I feel slow gentle movements throughout the day but I'm having really bad anxiety right now!