We weren't ready to tell the family yet. My mother has told two aunts

We told both our mothers about the pregnancy early, on the understanding that it stays with them for now. My mother has already told two of her sisters, 'in confidence'. One of them called my partner today to congratulate her. My partner is upset, and I'm the one who has to raise it. Not looking for opinions on whether we should be annoyed. We are. Looking for how others said this to a parent without setting off a week-long sulk.