Probably your gourd will be fine. If not, that will be a small price for learning a lesson.
You shoul have waited at least till the seeds inside rattle when shaken. When a gourd is green, its live and trying to mature. I have lots of bottle/birdhouse gourds. Some of them are almost dry, some half way and some are still green. They dry up quite fast as opposed to swan gourds that seem to have lots of flesh inside.