She was identified as Shaheeda Bi from Milner Street, Burnley. Police were questioning a man about the discovery.
A search was launched on Thursday after a severed head was found in burning vegetation on the A59 near Clitheroe in the Ribble Valley and a charred leg at a picnic site at nearby Sabden.
The woman's torso and other remains were found later at two separate places at Waddington a few miles away. They were examined by a Home Office pathologist.
Police searched a house in Whalley Road, Clitheroe, as part of their investigation.
A spokesman said the woman was only weeks away from giving birth when she died. Police are appealing for anyone who saw an Asian man driving a white M-registered Toyota Carina saloon in the area where the body was found to come forward.Reuse content