Peter James Williams lodged a bid for release in Tamworth Local Court on Wednesday morning, 24 hours after his arrest in Dowell Avenue.

Legal Aid solicitor Patricia Simpson submitted several bail conditions for the 37-year-old but the application was opposed by police prosecutor Sergeant Rob Baillie.

Williams is facing one count of assault occasioning actual bodily harm and did not enter a plea to the allegation in court.

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After hearing submissions from both sides, magistrate Julie Soars refused bail, finding the bail concerns could not be mitigated.

Police claim Williams was at the property in Dowell Avenue when a verbal argument unfolded about 8.30am on Tuesday.

It's the police case that Williams allegedly assaulted the pregnant woman, and during the struggle, she fell down a flight of stairs.

The alleged victim went to a neighbouring unit and called for help before police were alerted.

Paramedics treated the woman for lacerations to her elbows and back pain, and she was taken to Tamworth hospital for medical treatment and assessment. She was later released, police said.

Officers arrested Williams at the scene and he was taken to Tamworth police station where he was questioned and charged.

Williams will be moved into the custody of Corrective Services NSW and will appear via video link when the case returns to court later this month.