Annoyed by lack of privacy

My mother in law has been asking when we're going to give her a grandchild since my husband and I got married. We have been together almost 6 years now, married almost a year. It is worth noting, it's not as if we are her first chance at a grandchild. My husband is one of 6 kids, and she has 7 grandchildren with 3 more on the way. We've mostly avoided the question in the past, but I got my birth control taken out last month, with the agreement of "whatever happens, happens." We were visiting his family this week, and his mother once again asked "when are you going to give me a grandbaby?" And my damn husband responds, "well, we're not sure, but wife just got her birth control taken out!" In front of a whole damn houseful of his family. I haven't brought it up yet, because I'm not sure if I'm overreacting, but I'm honestly pretty upset about it. It feels like an invasion of MY privacy, as it was my birth control, and my body, and it feels as though he may as well announced go his family "whenever my sperm connects with her eggs!" I was mortified. I guess the question is, am I overreacting? I would never say anything like that in front of either of our families, especially considering I value my privacy. The best I ever say is "some day," because when we do find out, I would like to keep it to ourselves for a bit first. I just feel embarrassed and disregarded by my husband at this point.