Essential oils while Prego?

I have a keloid and read that tea tree would help shrink it. I didn't even think that maybe this is not ok:( I'm such an idiot! Is what I am doing ok? I put a drop on qtip and rub it on the keloid 1-2x a day. I feel like I am such a dummy with this pregnancy and I am so scared something is going to be wrong with my baby.