If you just had the brake pads replaced and not the rotors along with the brake pads then yes it's normal for new brake pads to squeal.
The squealing is normal until the new brake pads adjust to the shape of the old rotors and the squealing should go away within a few weeks or so.
If the squealing still lasts longer than a month you should take the vehicle back to the brake shop if you had a shop replace the brakes and have them look at it.
Squealing brakes are perfectly safe as long as your vehicle is able to stop correctly and should correct itself soon.