Could I have damaged my week-old gum graft?

Fishy smell after surgery, bad taste in the mouth could be indication of infection Usually this could be treated in early stages by taking a stronger antibiotic If left untreated and infection worsens,  the graft will need to be taken out or might even slough off by itself. 

There are different causes of gum recession clenching/ Grinding orthodontic treatment aggressive brushing smokinggenetically thin tissue type from the picture.  You do show some  wear and flattened teeth. So you might be a clencher/ Grinder a night guard...

Bad smell/ bad taste from the gingival graft site is not notmal you should have the site evaluated to rule out infection. You will need antibiotic to clear this infection meanwhile,you should continue rinsing with chlorhexidine mouth wash yo keep area clean 

From what I can tell by your photo, you are showing very minimalgum recession.  I would discuss with your orthodontist about howthey can move the roots of your teeth a little closer together to try andbring the papilla up and close out the dark triangles.  This may requirea little...

Your oral surgeon probably has the most experience with gum surgery and Accutane patients.  Please consult with your surgeon regarding this question.

Obvious recession may take years to develop and probably isn't a concern here. It is possible that there might be a rough margin, or tiny speck of bonding resin left under the gum. This can be easily remedied. Just give your dentist a call and have him take a look at it.