You cannot hack yourself. Can someone else hack you?
I guess that you are using your tablet for internet browsing and e-mail. It may be unwise to send and receive e-mails on a tablet that contain sensitive information. I would not do on-line banking on a tablet.
Your router should have a hardware firewall which is normally on by default and therefore, in your case, I guess is on already but it would help to which router that you are using.
IMO the threat to your home pc by using a tablet on your wifi is minimal.