Why would a women wear pad while not on period, when she has never done so before?

she has never done anything like this before, and we are not having best marriage at the moment, worried she may be being unfaithful. she has already had her period, and it has been a few days since she finished it and stopped wearing pads and tampons. then randomly she puts pad in, which she has never done before.. please help
Why would a women wear pad while not on period, when she has never done so before?
Post Opinion