First I would suggest to keep checking your watch and see if it is still losing time,
if so, you might have a problem with only your watch.
(do not reset it!) or mess with it! also take it to a reliable watch repair service and ask them to see what might be wrong with it. This should tell you if it could be related to your experience or just a watch problem. As far as your sighting, Mexico has been a so called hot bed of UFO sightings for quite some time. consider yourself lucky in that respect. if indeed it was a UFO