Sounds like you've been unlucky - grit your teeth and see how it feels tomorrow. If it's awful, or getting worse, give Abbott a call (not that I think they can
do anything as such, but if it's so bad that you feel it might be an issue with the - I don't know, hardware of that particular sensor - rather than an unavoidable misfortune of placing it, say, near a blood vessel of whatever - you know, like getting an occasional bruised lump when injecting insulin or inserting a pump cannula - perhaps they might be open to sending you a new one). If you're going to call them, DO leave the sensor attached and working.
When I had a problem with a weird sensor (not pain, just a load of WT*? readings) they asked me to leave it on for another 24 hours to see if it settled, which it did. But when I had one which failed, they replaced it. In nearly 2 years of continuous use I've just had two issues, to put that into context.
It is perhaps the case that you just hit something in your arm with the sensor probe. Ouch!