Five persons including a local BJP panchayat pradhan of Dhubulia area was arrested in this connection.
The incident occurred after a man identified as Shambhu Chandra Das of Tantla village under Dhubulia police station protested against playing microphone in high volume in a kirtan programme last night.
Das was then allegedly assaulted by several people and some others went to stop them. Mayarani Santra, the pregnant woman, reached there as her brother-in-law was being beaten up.
She was first taken to Dhubulia Rural hospital and then to Krishnagar Sadar Hospital where her unborn baby died this afternoon, police said.
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Das lodged a police complaint against five persons including the BJP pradhan Palash Kumar Biswas and they were arrested today.
Biswas said he was not involved in the incident and Trinamool Congress framed him.
Mayarani's husband Sanjay Santra claimed his wife was kicked in front of Biswas.