While the Supreme Court has held that the right of a debtor to convert her Chapter 7 bankruptcy case to a Chapter 13 case is not absolute, it is possible in some circumstances. Any debtor who has begun a Chapter 7 case may convert it to a Chapter 13 case at any time during the case provided the debtor is eligible for relief under Chapter 13. The only way to convert a case from a Chapter 13 to a Chapter 7 as of right is if the case was originally filed as a Chapter 7.
You may want to consider converting your case to a Chapter 13 if the bankruptcy court has determined that any of your debts are non-dischargeable, since Chapter 13 provides a somewhat broader discharge.