My gold crowns are coming off and they're not 2 weeks old, the dentist said because i had gum disease that the cement may not have sat right.

Moisture contaminant: Most cements used to hold crowns in place require a dry environment to seal the crown to the tooth. If the tooth gets wet the cement won't hold. It's a pain but just go back and have it recemented.

Might be: Contamination during cementation , and or bleeding gums might loosen the cement, have a periodontal consult to verify , two weeks is a very short time..

Gold crown: Crowns can come off but it should be rarely rather than after 2 weeks old. Sounds like you have an ill-fitting crown or a preparation that has inadequate retention to hold the new gold crown. Your dentist should redo this crown at no cost to you. Good luck.