i was charged but not convicted yet will it show up on my background
If a case had been filed, it is part of the court's public record and may show up on a background check.
Generally, California employers cannot ask job applicants about arrests or charges that did not result in a conviction; however, they can ask about pending charges, for which you are on bail or released on your own recognizance.
The arrest will. Records are forever.
I agree with Mr. Marshall.