Ohno.. Then you must have saved twice or more, and then there is no chance.
You can read about LMMS 2 different recovery and fail-safes here:
https://lmms.io/wiki/index.php?title=Ge ... 6_Recovery
Besides that, since you are new in Forum
Welcome hotlocalmom !
Here are all important links:
http://lmms.io/forum/viewtopic.php?f=1&t=4740
-A few rules and useful forum instructions