Please help! Is this. Normal.???

Plant leaves are slowly turning yellow and drooping started at the bottom now spreading... Buds look good about 1 1/2 weeks for harvest?

I dont know if those are that close to harvest, have you looked at the trichs? (crystals)

How long have they been flowering?

The yellowing is normal during the end of flower as usually the plants are being flushed and pulling from their reserves.

Gordo here. I am a new grower. My plants are losing their lower leaves also. Turning yellow and letting go. I was using a good magnifying glass to check the drops of resin. The jeweler's loupe came in today's mail! Clear trichomes with a hint of milk white on a few drops. Wait! It is hard but I've come this far and don't want to screw it up now. Also, study up on harvesting, drying and curing. That is more waiting, but it will be worth it for a quality smoke.

Agree, they look way off harvest time, possibly 4 weeks. The lower leaves can turn yellow as a natural part of the plant maturing but can also be caused by lack of N, this far away from harvest I would not be overly concerned but would look to rectify. Check your feed to see what N you are giving, some bloom nutrients do not contain enough, feed additional N to help. Epsom salts will also help. Don't go over the top with feeding though.

Droopy leaves can be caused by both under and over watering. Could it be that simple? What's your watering schedule?
JD

PS Looks more like underwatering to me.