I'm going to tell my boyfriend's mom that we're pregnant before my own mother
Why have you decided to tell your boyfriend's mom first before your own mother?
I'm so happy I can't wait to tell everyone.
It doesn't sound like you are doing anything wrong. You should tell your closest family about the pregnancy first so telling your boyfriend's mom makes sense.
Didn't you hear me? I said I'm going to tell her first.
I heard you, but it is ultimately your choice and if you don't keep anything from your mother then I would be okay with that. You can tell your boyfriend's mom first, but do not wait too long to tell your own mom as they may get worried or may get angry at you if they find out about it from someone else.