I didn't wean until around 18 months with my first daughter and 20 months with my second. I was also ebf throughout our nursing relationship, so obviously differently. The first time, I needed to wean when I did, so I dropped feedings and decreased supply, but I didn't totally stop the dom until we were done nursing.
The second time, I started weaning off the dom around 14 months and very slowly dropped one pill at a time. I ran out of dom totally when she was around 18-19 months. My supply dropped significantly as I got down to 40 mg a day, but she was solidly on solids, so it didn't matter. My period returned after a stopped the dom, but before I stopped nursing.
Good luck.
Jennifer