Well I have read somewhere that even males can be used for THC by way of hash oil... but since you only grew one the amount of time it would take to grow it all the way in and harvest it you would just be better off starting a new plant. Sorry.

You could however take the pollen from the male and use it later to pollinate the lower branches of a female to get seeds from. Just lay some black paper around the plant and let it go for a week and you should have a good amount of pollen on the paper that you can put into a film canister (or something similar).

Disclaimer: I haven't even grown a plant.