If you cut back gradually, you may find your cycles return before you wean completely. Most women probably can ttc while still breastfeeding if they want to, though some do need to wean completely for their cycles to resume.
I cut out night feeds at 14 months, and by 16.5 months we were down to 3 feeds per day when my cycles resumed. I cut back in order to ttc, but was hoping I wouldn' have to wean completely (and didn't).

Good luck!