Dear Sir,
You are in safer zone since she was carrying when married to you. She cheated you for not disclosed earlier affair. You must select an intelligent advocate. Please see section 312 of IPC and it is not applicable to you. Better you file 482 CrPC petition before HC for quashing.
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312. Causing miscarriage.—Whoever voluntarily causes a woman with child to miscarry, shall, if such miscarriage be not caused in good faith for the purpose of saving the life of the woman, be punished with imprisonment of either description for a term which may extend to three years, or with fine, or with both; and, if the woman be quick with child, shall be punished with imprisonment of either description for a term which may extend to seven years, and shall also be liable to fine. Explanation.—A woman who causes herself to miscarry, is within the meaning of this section.