I announced my pregnancy the same weekend as a cousins bridal shower
Seriously? Why would you announce your pregnancy at that time?
I didn't even know until my cousin told me in the middle of her speech
What terrible timing, you shouldn't announce a pregnancy during a family event. You should wait and announce your pregnancy at a different time than your cousin's bridal shower.
That's not my fault, I didn't know she was getting married. I'm not going to apologize.
If you didn't know then that is fair, but if you did know then you should apologize. You shouldn't announce a pregnancy when you hear that someone else is having a bridal shower. Wait a week, at least.