my sister announced my pregnancy for me 😔 kinda rant

hi guys so I’m 19 years old, currently 14w5d pregnant. I haven’t told anyone on social media but I know my closest family and friends know.

I was waiting for my next appointment, at 16 weeks to get a picture and to tell everyone.

But last night I started getting messages saying “congratulations! I heard from your sisters Instagram.”

She’s my twin sister.. she has an Instagram that isn’t private and then a private Instagram. I don’t follow her private one so I don’t know what she said about me, or even why. this is my first pregnancy, I really didn’t get the chance to tell anyone myself. I only told my mother and my fiancé myself..

My sister even got very mad at me earlier on and told my dad and my older sister.

I’m so upset and I don’t know if I’m being ridiculous.. she’s a very cruel person. if I bring it up to her, I can only expect a huge argument.

a couple of days ago she told that she had sex with a guy and then messaged his girlfriend, who is pregnant, and she told me “she thinks I won’t fight her but I would”

I don’t know what to do!! Am I being ridiculous for being so upset about this?