Incident report was initiated and I didn't fall...

First time on a road bike (any bike) with 245M and watch initialed indicemt report within 4 miles  (possible dip in road for water run-off).  As this was my first time on the bike I didn't pay attention  to all the vibrating of my watch cause I'm doing 18-20 mph...   didn't realize the incident and my family kept texting me are you ok.

I will try the same route again next week, but how sensitive is this and should I keep expecting incidents?