Worried

I’m 27 weeks pregnant and today I had my Glucose test the drink wasn’t bad at all I know I’ve seen some people asking about it. It tasted like orange Fanta with a little more sugar. Today when they measured my uterus I ended up measuring 3 weeks behind. My baby’s heartbeat has always been higher around 160’s. Today it was 135, my question is should I be worried measuring behind and that she has a slower than her usual heart rate? My doctor didn’t seem to concerned but I’m still a worrier!!