I know very little about fungus but it doesn't really look like it. It's evenly distributed across every leaf. Because fungus spreads asexually it radiates from several regions. This doesn't appear to be the case. If you look at the right most leaf in the picture you can see hairs. Now...
Autoflower? It's only 7 days old and maybe pushing a 1/2 inch across. Does that sound right?
I got the seeds from cannabisseeds.com. I ordered White Rhino but none of the seeds germinated so they sent me 12 White Widow. I'm not impressed with their seeds.
Anyway, the seedling has been...