A pregnant cow awaits rescuers after getting its head stuck in the window of a WWII pillbox in Lincolnshire, UK on October 2. Photo: CFP

 This is the moment a pregnant cow got her head stuck - in a WWII pillbox in the UK.

But don't worry, the Lincolnshire Red, who is due in February next year, has been rescued and is now doing fine.

The cow got stuck in the window of the pillbox on October 2 morning and is believed to have been trapped for around four hours after the stone causing swelling around her neck.

A vet was able to sedate her at Gibraltar Nature Reserve in Skegness, Lincolnshire and a search and rescue team arrived to help after receiving reports of the trapped animal.

"The cow became stuck in the window opening of this wartime pillbox at 10:30 am," said a Lincolnshire Fire and Rescue spokesperson.

"A vet attended and sedated the cow then we set it free using heavy breaking equipment.

"We left the scene at 5:30pm. The cow is OK and now walking round. She is pregnant and expecting around February time, so fingers crossed all is OK."

The team chipped away six inches around the stone window of the pillbox.