Mom told my dad and lied to my face

So I told my mom I was pregnant about a week ago and my dad has been out of town so I have been waiting to tell him (we live very close to each other so i’m in constant contact and with them a lot of the time). This baby was a surprise so I know she has mixed emotions but overall she seems happy. She’s told me many times that she has not told my him, however, my dad has been acting different over text/ phone calls but she continues to assure me she hasn’t. Well I heard her talking to him over the phone today (she didn’t know I could hear) and yeah maybe I shouldn’t have been eavesdropping but when I hear someone talking about me i’m gonna listen. Anyway they were talking about my pregnancy. I’m not upset that she told him but i’m upset that she is lying to me that she hasn’t said anything. I just don’t understand why she would lie about it and I’m very hurt and I don’t even know if I should confront her at this point. I’m pissed tbh and i don’t even feel like telling him anymore 🤷🏻‍♀️ EDIT: I told her to tell him the day i told her but she said she didn’t want to and that she wanted me to be the one to tell him. I WANTED her to tell him, she said she didn’t want to.