08/06/2015 02:44 EDT | Updated 08/06/2016 05:59 EDT

Cheryl Bau-Tremblay's boyfriend questioned by police

The boyfriend of a pregnant Beloeil woman who hasn't been seen since Saturday is being questioned by police. 

The Sûreté du Québec says he is considered a witness at this point in the investigation.

Cheryl Bau-Tremblay, 28, was reported missing earlier this week after police said she left her home on foot and didn't return. 

Bau-Tremblay is five months pregnant. 

Police said she had returned home from a few days in the Eastern Townships just before she disappeared. 

The Sûreté du Québec is now assisting the Richelieu-Saint-Laurent with the investigation.

Bau-Tremblay has still not been found. She is described as five-feet-two-inches tall, about 140 lbs with black hair and blue eyes. She speaks French and has a tattoo on her wrist.

Anyone with information is asked to call Info Crime at 450-922-7001 ext. 399.