Not as an advocate, but as a brother this is piece of my advise: Well its not surprising to hear such thing in this country or in any other corner of this world, as such things do happened to millions of youths, boy cheating on girl and vice versa. yes, there may be a case of indictment against your boy friend, but not the vengance but your future and the unborn child in your womb are at stake. Take things cooly and ponder all the pros and cons least you take the wrong steps to be regretted through out your life.
Supposing you won the case against your lover boy and embrassed him through legal action, what is the benefit to you and the unborn child in your womb? The matter will get worse never to be reconcile in life for both of you, more over it was a contributory negligence for both of you to go up to that extend without any future plan for marriage? So stop the blame game and all those dirty washing linean in the eye of the people and stand up courageously at lest for the sake of the innocent sweet child in your womb. Indian women are known for their courage so keep it up and face the future courageously. One monkey goes thousands monkeys will come in, dont bother.
Just go for maintenance under section 125 of the Criminal procedure Code, as 125 Crpc is not confined to legitimate child only, who knows one day your lover Boy may come to you with folding hands to forgive him and your child may become one of the most important person in India..May God Bless You.