I had a peak in blood pressure a couple of weeks ago, it had spiked more than 20 points above (which like you is when they worry). Like you I was monitored & my blood pressure within 4 hours had dropped back 10 points so the concern was relieved. I knew it wasn't a medical fault as I was experiencing discomfort in my swollen fingers during that time & it pretty much subsided later when my BP dropped.

I have had PE & really it's great that they took it so seriously, my PE wasn't picked up until it was almost to late risking my life & my DD. It is a little worrying so I can understand your concern but better safe than sorry