I agree with mellow. Looks normal and healthy.

I learned the bottom leaves can go bad for many reasons....most often though it because the lower leaves can be in the dirt or touching the dirt. They don't like that.

Also, when watering perhaps some water and nutes are being splashed onto the lower leaves and thats another thing they dont like.

The spotting however would have me concerned, but perhaps its over if its a couple of weeks old.

how long has this plant been flowering???