Not telling the dad?

So I saw a post on social media and this girl said her and her boyfriend broke up and she just found out she might be pregnant.

People were commenting about how she shouldn’t tell him and that she doesn’t need to tell him if she’s pregnant because that’s her child. I said she should tell him because he’s also the father. 50/50 people. She stated that she is going to tell him and people keep saying not to if she is pregnant

Someone also said she shouldn’t tell him until the baby is born(if she’s pregnant)

Opinions?