Any special antivirus for bluetooth in laptop or the normal ones are fine

I would expect the usual antivirus programs to cover bluetooth nowadays. The integration of bluetooth into a laptop is commonplace, so it is logical to assume that the antivirus software companies will protect this . All the major antivirus companies are constantly updating their products. As for someone accessing your laptop via bluetooth, this would be the same scenario as a mobile phone and depend on the settings that you are using. Go into the settings and you will be able to select who can see the laptop and what permissions this gives other people. As long as permission is required to transfer files then you should have no problems.

The normal ones are good enough...Because if there is intrusion to your data, your antivirus should be able to pick up and alert you about it. What you should do is to disable the Bluetooth when not in use. Only turn it on when you want to use it. No one can unknowingly transfer files to your PC because you need to acknowledge the transfer. Moreover, Bluetooth transfer usually requires password from the sender to the receiver. So if the sender didn't provide you with a password, you will not be able to receive the transmission