Am I being unreasonable?

When me and my husband found out I was pregnant I told him I didn't want to know the gender. He wants to know and I told him that's fine he can find out but isn't allowed to tell me or anyone else. He goes back and forth on which pronouns he uses so I wont know the difference. I have my anatomy scan tomorrow and his mother and grandma keep asking that my husband tells them the gender as soon as he knows. Its really frustrating me because I told them from the beginning I want it to be a surprise and that the more people who know the more likely it is that someone is going to tell me. I asked my husband if he thinks I'm being unreasonable by wanting to keep it a secret and he told me he doesn't know why it's a big deal if they know/ if I find out. I feel almost pressured into finding out the gender now because it's silly for me to get my hopes up for a surprise and then someone ruining it. I'm not sure if I'm just being hormonal or if I'm actually making sense.