Antibiotics & SCD?

I'm on the SCD diet because I believe that there is an overgrowth of bad bacteria in the guts.

So my doctor wanted to prescribe me some antibiotics. I said no for right now.

Would antibiotics destroy my gut flora? Would it destroy only bad bacteria or the good ones too?

How would it affect my SCD diet? Would I have to start over after I'm done taking the antibiotics? Would it actually help killing off the bad bacteria faster or would it rather help the bad bacteria to overgrow again?

Thanks :)