I have no power at all in my masterbath. I changed my GFI outlet and the breaker but I still don't have any power. Where could I go from here before I call an electrician. Thank you

Does the breaker trip or does the GFCI receptacle trip?

Step one, turn the breaker off and verify that the receptacle is installed correctly. Most often that is the error. The second most common error is the breaker is not wired correctly. Is this a GFCI breaker or a standard breaker. You do not want to protect a GFCI receptacle with a GFCI Breaker. The two of them do not behave nicely.

If it is the GFCI receptacle, you need to check device downstream of the GFCI.. It is reacting to a short somewhere in the circuit.

If the breaker is tripping, disconnect the feed side of the GFCI receptacle, turn the breaker back on and see if it trips. If it does, there is a problem between the circuit breaker and the GFCI breaker.

Did you push the reset button on the GFCI? If this outlet is wired to or from another source did you make sure you used Line and Load sides properly? Did you measure to see if the breaker is showing out voltage? Breaker set properly? Why did you change the breaker and outlet?