English homework problem helpp

1 - I'm sorry I'm late. I've (been) to the doctor

2 - I'm sorry I'm late. I've (gone) to the doctor

Which one is the right one? Gone or Been?
Honestly I think it's "been" but I dunno

Thanks arleady for helping :)

(for the contest I'm italian and since I'm learning english this is one of the homeworks for tomorrow and I'm not sure which one is right)