Footage Comes Out Pixelated After Export

Help!. When I exported my project it comes from the clear HD preview in FCP to a blury pixelated video. I have tried exporting it in differant formats such as h.264 and apple prores 422. Does anyone known how to fix this. If you need an additional infomation dont be afraid to ask, any help is appreciated.

Regards

Steves Assistand