Fast fetal heart rate?!

So today I went to my regular checkup, I'm 33 weeks. When she went to check the babies heartbeat she looked concerned and told me that it was very fast. However she didn't tell me what the number actually was. She continued to hold it there for a few minutes and then asked if I had been feeling sick or if I've had a fever (which I haven't) she checked my temp. (It was 98.8) then rechecked the heart rate and said it was now in the 160's and that she could live with that. I sat back up and she told me that it gives her some relief that I'm still feeling baby move but if movements stop to go to the hospital immediately and told me to come back in 2 weeks then left the room. 
Anyone have anything similar happen to them? I'm a bit upset that she didn't give me anymore information about what she was thinking could've possibly been happening or why she was asking if I was having any of these symptoms.