There is an extremely high likelihood that this matter will be filed as a misdemeanor, not a felony. You won't face any more jail time. You may be able to avoid a conviction entirely if the retailer agrees to a civil compromise. In any event, the court will not impose drug conditions in a matter resulting in summary probation or where there is no basis to order testing.
Because this is your first offense, you have a good chance at getting the charge reduced and a non-custodial sentence. You need to discuss all the facts with your lawyer and explore all the options for resolving the case. There might even be a diversionary program available for this kind of crime. Make sure you discuss all options with your counsel, including the likelihood of drug conditions for probation. Every case is different and there is no way to predict what the outcome of any specific case will be.