Just broke a mirror is there anyway of not getting bad luck?

The superstition of bad luck is based on an idea called "confirmation bias." Because you're paying attention to your fear of bad things happening, that's all you notice.

You can also choose to pay attention to all of the good things happening, and you'll suddenly realize that you have good luck.

Everything, good luck and bad, is an opportunity to learn. In the case of a broken mirror, it's probably better to learn how to be careful with something breakable than it to worry about the bad luck that results.