Check out the good book "Getting Past No" (the follow-up to "Getting to Yes") - this is called having your BATNA - Best Alternative to Negotiated Agreement and

Check out the good book "Getting Past No" (the follow-up to "Getting to Yes") - this is called having your BATNA - Best Alternative to Negotiated Agreement and will help your position even if you don't have to bring it up, just having it in your mind could boost your confidence and help you ask for what you want