Aoife Phelan has not used her phone or bank accounts since she went missing, gardai said.
The 30-year-old live-in nanny from Cashel, Ballyroan, was last seen at Colliers View in Portlaoise on October 25.
Last Thursday evening Aoife's family -- who say she is four months' pregnant -- were joined by friends and neighbours at a candlelight vigil at the spot where she was last seen, as gardai manned nearby checkpoints while handing fliers to motorists and pedestrians.
"We are still actively searching and going into as much detail as we can," a senior garda said.
Gardai are becoming increasingly concerned as time passes, the officer added.