I've recently tried the mobile check deposit. I deposit the check on Saturday it said it would be in my account Monday but Monday came and there was no money. I Needed the money so I cashed the check. The problem is I just checked my account and the money is there. I don't know what to do or what's gonna happen. Can anyone help me?

You've screwed up by in effect passing the check twice. "Monday" means that the deposit transaction will occur Monday (evening). Go tell your bank immediately.

That would be double dipping on the same check. Call your bank NOW!!

Talk to the bank manager and make sure that you repay the duplicate funds immediately.

Call your bank