What should I do if my ex-boyfriend is pregnant with my child?

The ex-boyfriend of his first love has returned to China, and there is a four-year-old son Song Yang who is so angry that his nose is crooked. He has been waiting for so many years, but he did not expect that the other party is married and has a child, old Song!Why does this brat look so much like you? If you didn’t know it when you were young, you thought it was your son farting!How could two men have a cub? !The whole world is saying that the ex-boyfriend looks like my son, and he feels more and more like him