Australian Jillaroos star Sam Bremner has announced she is expecting her first child and revealed the bizarre way she found out about her pregnancy.

The Jillaroos fullback took to Instagram to deliver the news to her followers on Friday afternoon and later told NRL.com it was international teammate Ali Brigginshaw who spiritually encouraged her to take a pregnancy test.

"Ali was so random, she called me to say she'd had a dream that I was sitting next to her by the pool and I told her I was four weeks pregnant," Bremner said of a conversation she had with Brigginshaw last December.

"I reacted saying maybe it was a premonition? I believe in all that stuff. Later that day I went past a Chemist Warehouse and picked up a pregnancy test. I had no symptoms and it come back positive.

"I was over the moon. Wayne [Sam's husband] wasn't home yet but I was running around screaming with my dog."

Bremner, 27, played one game for the Dragons in the inaugural NRLW competition last season before succumbing to a toe injury.

The St George Illawarra representative was appointed Jillaroos captain by Brad Donald in October before she withdrew from the Trans-Tasman Test against the Kiwi Ferns after failing to overcome the setback.

View this post on Instagram The BEST upgrade yet 💜👶🏼💙 #babybremnercominginhot A post shared by Sammy Bremner (@sammybremner) on Feb 7, 2019 at 9:26pm PST

The pregnancy news will keep Bremner on the sidelines for the Harvey Norman National Championships and Holden State of Origin clash, while a second year in the NRLW also appears unlikely.

She aims to return to the field for the international Nines competition in October but will not place any pressure on herself to rush back.

"It's one of those things you can't time well and with our calendar year you're almost playing all the time," Bremner said.

"I want to be involved for the next World Cup in 2021 and I couldn't be pregnant that year.

"I really wanted a family. I've thought previously that having a family would end my footy career but it wasn't until I spoke to other players and had a chat with Brad Donald last year about family that I realised I can do both.

"I'm lucky to have the teammates, coaching staff and family I do."

Bremner joins Nakia Davis-Welsh as the second player from the successful Jillaroos World Cup squad to announce her pregnancy in recent months.