Quoting Mrs. Mommy to 6 ღ 31:" no, there's really nothing to tell him.. it might not be anything and i'm not saying anything unless i have to."
That's a really childish way to look at things. He has a right to know that it's his and if you have any doubt (which you do, or you wouldn't be asking this question) you need to tell him. You should have told him prior to getting married. You should have told him when you first found out you were pregnant. You are incredibly selfish and self serving to keep something like this a secret.