
He had a boyfriend before, which is the son of the old man, and they just found out that his ex boyfriend was actually his husband's half brother.
Before he got into the mafia and all, he got pregnant with his ex boyfriend. But because the old man, his ex's dad, didn't like that the MC was an omega, he had the MC's ex choose, whether to continue being with him or leave him, he'll be killed in the first option along with the baby.
So his Ex chose to kill their baby while it was still in the womb and hid the MC. That was all in the past but the baby that was lost haunted the MC.

Remember when he was with the other brother at the very start he was blinded by his "nice" persona and actually got pregnant. He told the brother after contemplation and that he really wanted to see it to term, the brother acted as if he's happy and ready to leave his wealthy family and run away together only to spike his drink to cause him to miscarry the child. He got trauma from that incident for a LONG time, which is why he was so scared to say anything when he got pregnant with our cute baby and why he's nervous now to tell the ml that he's the antagonist's half brother, because it would make him aware the mc carried a child from his half brother before, and not just an asshole who has no relation to him.
whose child it is can someone explain me? did he get pregnant from the time when he was raped or what?