"Look at me...I'm special"

I'm not sure why this behavior bothers me. I attended a training session this morning given by our resident corporate trainer, who just got married recently and is pregnant. Before class started, she made the announcement, "In case you're wondering, yes, I am pregnant." What on earth would make someone do this? Because I wasn't wondering. And now I'm slightly annoyed that you think you're so special that we all have to pay attention to you and your singularly unique situation.