AFTER being told she would probably never be able to have children, 19-year-old Jessica Leonard became pregnant with her "miracle baby".

Now a full-time mum, Ms Leonard hopes she can raise enough money to undergo surgery to remove her endometrial tissue.

Ms Leonard was diagnosed with endometriosis two years ago, after being in and out of hospital with intense pain.

Endometriosis is a disorder in which tissue that normally covers the inside of the uterus, grows on the outside.

Symptoms include pelvic pain, heavy periods, bowel pain and infertility, and nearly half of those affected experience chronic pelvic pain.

Ms Leonard said she saw three gynaecologists before one decided to do surgery to find out if she had the disorder.

Ms Leonard said she was told it was unlikely she would ever be able to have a baby.

Last October, however, she discovered that she and partner Callan Watts were expecting their daughter, Addison.

"She was a bit of a miracle baby," Ms Leonard said.

"There were lots of doctors that said when you have (endometriosis), and especially with where it was, it would be very hard … they did tell me from the start that I could either have a miscarriage or ... it could affect (the pregnancy) or she could have come out with maybe Down syndrome or something like that.

"I had lots of complications during that pregnancy, but at the end she turned out pretty good."

Ms Leonard said her pains returned a month after giving birth.

"I was sent to Adelaide to see a specialist there and now they want to do a surgery and it is a bit of a major one as it’s on my kidneys and my bladder," she said.

"This one I have to pay for as it’s a specialist, but it is very expensive for a mum that doesn’t work. They recommended that I start a GoFundMe (online fundraising campaign) to raise money for it."

Ms Leonard is hoping to raise $5000 for the $6500 laparoscopic surgery, which is expected to occur in February, so she can live a normal life without heavy cramping and stabbing pains.

"It (affects day to day life), especially when I have big flare ups," she said.

"I have to get people to look after Addison because I can’t get out of bed."

The surgery would remove the endometrial tissue, which has spread to her bladder and kidneys, effectively stopping Ms Leonard's endometriosis symptoms.

To donate to Ms Leonard's surgery, go to www.gofundme.com/f/jessica-endometriosis-removal-surgery?qid=ca7e92189aaa3a05de3a235753feefe5