Am I overreacting?

OK this may be long, but I need to vent.. so we found out we're having our 2nd boy last week. We definitely were disappointed because we wanted a girl as this will be our last baby. Anyway, my husband is always so controlling so of course he tells me to tell my mom not to say anything and he doesn't want anyone knowing yet. I told my best friend of 27 years BC we tell each other everything, but I feel like I'm not allowed to tell people what MY baby is.. we chose a name and I was like since this is the last baby and we know the sex let's keep his name a secret BC it'll be the only surprise. He agrees.. so fast forward to yesterday. I found out that I have an elevated risk for having a child with Down Syndrome. I feel like that's pretty private info. I tell my mom BC she's my best friend and she went through the same thing with my brother(who turned out to be nuerotypical). I get home and find out he's been discussing not only the sex, but our increased risk as well with his "aunt". I put quotations BC he's known this woman for 3 months and she is the sister in law to his god mother. This "aunt" has a daughter who's a few years older than us and they're suddenly bff as well. So he's on the phone with her this morning and tells her everything plus the baby's name. I was like wtf I thought we weren't telling anyone and he puts it on mute and reaponds... knock it off she's already paranoid saying she doesn't want you thinking she's trying to steal her man.. WHAT?? Where did that come from? now I'm suspicious BC that never crossed my mind, but I guess it should now! Mind you my husband has severe anxiety and controls everything and doesn't let me tell my own mother things, but tells these other people. Am I overreacting to being furious about this? he would lose his mind if I did this btw.