Figs

I have a four years old Brown Turkey fig tree growing in a 15"pot. This year it produced 31 figs during the summer which grew to about half the size of a full grown fig. I know that figs are supposed to stay on the tree until the following year where they will then mature and rippen. All but three of the figs on my tree have dropped off. As they had prematurly started to colour was the tree trying to crop this year or was there some other reason why they have all dropped off?