Am I overreacting???? Someone else announced my pregnancy.

So I’m 17w3d and haven’t announced on Facebook yet. I am waiting till I’m further along and take some pics and make it fun, bc I’m going to be a single mom. My sister decided to post on Facebook saying that I’m pregnant. I am so angry. So frustrated. So annoyed. Why would she announce for me????? I texted her after I saw it, and asked for her to remove it, because I haven’t announced it yet. She never responded but deleted the post. To add onto that, we aren’t even close, and have the same friends on Facebook, so I’m sure everyone knows. 😭😩