Frozen bathtub pipes
As suggested: If water is not running it can wait. The problem may be that when it thaws the pipe may have ruptured. If the pipe is ruptured and the ice melts it could make a mess in a wall but it may also be a pipe under the house that you may not realize it is leaking unless it is large and your water pressure drops. But with cold temps some times it can take a few days above freezing and closer to 40 to thaw if the floors are insulated. You may get lucky and not have any leaks when it thawes out.