Arya Samaj Marriage annulment

Hi, I got married on May 1st 2024. Mine was a love marriage. But my wife never disclosed that she was pregnant by 6 months on the day of marriage. When asked, she told my family that she didn't know she was pregnant. How can someone not know for 6 months if pregnant or not? Also she claims the child is mine. She had multiple affairs on the past but I ignored and forgave her. We got married in Arya Samaj Mandir and on the affidavit and, consent form and marriage certificate she put false signatures which do not match her original signatures on her passport and other documents. When questioned, she said she forgot her signatures as she has not been using her signatures for few years. We haven't taken the Arya Samaj Marriage certificate yet as her signatures are wrong/manipulated. My marriage was only for 11 days and we sent her back to her parents once we came to know of the 6 months pregnancy. We are not able to establish whose child is that - whether mins or someone else's. She started harrasing my father and mother who are senior citizens and and insulted and humiliated me in public and in front of my parents. After she has left, we haven't heard back from her. Can we get the marriage annulled as she was against getting a divorce for a 11 days marriage.