Carbon Monoxide detector

My wife woke me up at 6 am because the smoke alarm was going off but the alarm functions as both a co2 alarm and a smoke alarm. She is pretty sure it beeped 3 times a few times and stopped but is second guessing herself and saying it could’ve been 4. This happened a few months back and our neighbor had a co2 tester that came back clean. I’ll have someone check it out today but my question is if it stopped after a few sets of beeps should I be worried