Welcome Topic,
Don't believe all you read in a seedbanks write up. All of them exaggerate how quickly they finish.
Older fan leaves will yellow and drop off. That's normal. It looks like you have a week or two to go yet, which will give you time to give her a flush. Read the stickies in the relevant sectiond for when to harvest. Your loupe will help.
If that is your first grow, you have much to be proud of. Well done. Just make sure you finish it off well with a good dry and cure.
eP.