Growing up, Liz thought her life would follow a predictable trajectory: meet a man, fall in love, get married, and have children.

But her path twisted and turned in unimaginable ways.

"It took me a while to find a man of substance," Liz told Mamamia .

When she married her husband Greg at 35 years old, Liz was aware that her biological clock was ticking.

And she wanted to waste no time starting a family.

"We tried and tried and tried and tried and tried…. and it didn't happen for us quickly at all," Liz, now 56, said.

For the next 18 months, every pregnancy test remained negative. So the couple visited a doctor, and were referred to a fertility specialist.

After many tests, they learnt the hard truth.

Greg had anti-sperm antibodies — proteins that mistakenly attack sperm cells.

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