Last year, I got pregnant and then miscarried at 12 weeks. DS was still nursing throughout that time and he was 3-3.5 years old. I most definitely had milk when I got pregnant. After the miscarriage, I went on the Nuvaring... ended up being on it for only a few months, maybe 4. At some point during all this, my milk did dry up. I cannot say for certain what caused the dry up... DS's age? The pregnancy? Nuvaring? I have no idea. I do know that I would not take the chance and go on it again unless my child were already acting like they were wanting to wean, just in case.
In DS's case, he didn't really care that there was no milk. At his age, he was getting virtually all of his nutrition from food and only comfort from nursing and he was content to keep nursing for comfort without any milk. He frequently told me there was no milk, but that he didn't mind "getting milkies with no milk." He didn't wean for another 9-10 months after my milk dried up.
So that's just my story with the nuvaring. Hope it helps.
Just FYI, nuvaring did not upset my reproductive system and I ended up getting pregnant the next cycle after stopping it's use.
Wife to Brian , mother to Xander 10/26/05 and new squishy, Claire 9/26/10 .