I really don't see any issues. If you are still doubtful, change all your router and login passwords.
Hi yk7.
Like I said nobody is going to go to all this hassle to get into your pc. As suggested above, new password, new SSID, enable MAC Filtering, Make sure your using WPA/WPA2 and if you really want to disable SSID broadcast, most smart phones and still pick up the SSID though. But If someone was to do this, it would be very hard to do so I don't think there is any issue here. Make sure your password is strong and more than 8 characters here is an example. (S37enF0rum$) Please mix them all.