Grethe Andersen says she feels "self-conscious" after a Jetstar attendant asked her if she was 28 weeks pregnant.

Jetstar has had to apologise to a Wellington woman after one of its flight attendants mistook her for being pregnant.

Grethe Andersen, 24, was flying from Wellington to Auckland on Sunday for a weekend away with friends.

While boarding the flight, a male attendant motioned to his stomach and said something she could not hear.

MAARTEEN HOLL/ FAIRFAX NZ Grethe Andersen says she feels "self-conscious" after a Jetstar attendant asked her if she was 28 weeks pregnant.

When she asked him what he had said, he replied by asking if she was pregnant.

"At first I thought he was asking how heavy my bag was," she said.

"He signalled to his stomach and said 'How many weeks are you?' I was stunned and shocked, and said 'I am not pregnant'."

Andersen said those around her had heard what the man said, leaving her feeling embarrassed and self-conscious.

Once in Auckland, she raised the matter with the cabin crew leader.

The man told her they usually asked people if they are more than 28 weeks pregnant for safety reasons.

Neither the man nor the cabin crew manager apologised to Andersen for asking the question.

She posted her disappointment on Jetstar's Facebook page, with many others commenting on how insensitive the question was.

"I was there to celebrate with my girlfriends, dress up and look good. As a woman, it's not a good feeling when you're asked if you're pregnant and you're not," she said.

Some pregnant women posted photos of their baby bumps on the Facebook page to show the difference between Andersen and themselves.

Jetstar's policy requires mums-to-be who are 28 weeks pregnant or more to carry a medical certificate from a doctor or midwife, dated no more than 10 days before travel, to confirm their estimated date of delivery, whether it is a single or multiple pregnancy, and that there are no complications with the pregnancy. Medical clearance is required if the pregnancy is not routine or has complications.

The airline contacted Anderson on Tuesday evening, offering her an apology and a $100 voucher.

She said she was grateful for their call, but thought they needed to handle the matter with more sensitivity in future.

"They need to learn new ways to approach to ask that question. It is a tough subject to approach, but it can be done way differently."

JETSTAR PREGNANCY FILES

* October 2012: Jetstar male flight attendant demands a medical certificate from Kelsey Hughes, then 21, wrongly suspecting she was more than 28 weeks pregnant. The mortified Cantabrian mother-of-one was not expecting and, at 70kg, believed she didn't even look eight weeks pregnant. She was offered a $100 travel voucher.

* September 2012: Wellington woman Janine McKenzie-Minifie, then 32 weeks pregnant, is ejected from a Jetstar flight from Christchurch to Wellington, despite flying with the airline only days earlier. She had been unaware of the airline's pregnancy policy and had checked with flight staff before boarding.

* August 2012: Wellington woman Sarah Clear, then 35 weeks pregnant, is escorted off a flight before takeoff from Auckland to Wellington in front of 150 fellow passengers. She had flown to Auckland four days earlier and had no idea she was breaching the airline's pregnancy policy.