Video recorded on iMovie disappeared. Help!!!

Hello, today i was recording a 3 hour long video on iMovie with the built in camera on my MacBook and when i clicked stop recording the video disappeared. I checked the event i imported the video to and it's empty. I know for a fact the video was properly recorded because before i started recording, the storage on my MacBook was 103 GB and now it's 84 GB, so the video was recorded, I just can't find it. I already looked in the 'Show package contents' and the video wasn't there. Can someone please help me. Thanks in advance!