Fetal Heart Rate 167 at 23w2d?

I went in for an ultrasound today due to brown spotting that I’ve had on and off since 16w. The tech said my cervix and placenta look great, so they weren’t able to determine the cause, but the doctor wasn’t concerned after the tech showed her my results. However, when they took the baby’s heart rate, it was higher than any previous time it’s been measured (even higher than it was at 8w). I pointed it out and the tech asked me if I might’ve eaten or drunken something sugary or caffeinated recently—I’d had some coffee at 6am, but other than that I’d had only water till my 1:30pm appointment, and I hadn’t eaten since 6am either. I was anxious, but I’m not sure if my anxiety could affect her heart rate so dramatically... (lately she’s been in the upper 130s or in the 140s). The tech didn’t say much else about it so I’m not sure if I should be concerned... Has this happened to anyone else?