Why be mad? Thats private thing between your mother and father. Even if she had it when you were 2 or last week, its a private matter. Do you tell your mom everything?

My mom had an ectoptic pregnancy when I was 3. She ended up having emergency surgery to remove the fetus (it was a girl) and it was only when I was in college that mom told me I almost had a baby sister. Was I mad? Nope, just disappointed that I could have had a sister.