The strains on patients undergoing fertility treatment

"Emotionally, nothing prepares you for IVF treatment at all. It was a difficult time but worth it".

Kayleigh Taylor describing her fertility journey. It is a path an increasing number of couples in Scotland are taking to try to have a baby.

One in seven couples will have difficulty having a child, and about 2% of births in the UK are now the result of fertility treatment.

Kayleigh and her husband Ross, who are both in their 30s, were lucky. They conceived their twins after their first IVF. Reese and Riley are happy and very active two-year-olds.

But others are not so lucky.

Cathy Marston , 45, has one daughter through IVF. But she wanted to add to her family.

"It wasn't until two further attempts failed that I understood the complexities and the torture that you go through with fertility treatment", she said.

The number of IVF cycles women in Scotland can get funded on the NHS is going up to three from two from next year.

And couples where one partner already has a child will also be eligible for funding.

It followed recommendations made by the National Infertility Group in Scotland.

The British Fertility Society said the announcement on the extension of IVF treatment was "great news for people in Scotland".

Now, for the first time, a new Outcome Prediction In Subfertility (OPIS) online calculator is aimed at predicting cumulative chances of a couple having a baby over six cycles of IVFs.

Within Scotland, a complete cycle is defined as one fresh and any frozen embryos resulting from that cycle that could be replaced at a later date.

Previous models have predicted the success rate of just a single fresh cycle.

Most agree it is a gruelling journey.

But the idea behind the new calculator is that it will help couples and clinicians "shape expectations".

Siladitya Bhattacharya, a professor of reproductive medicine at the University of Aberdeen, said: "Previous predictors have been able to give people an idea of what their chances would be after their very first cycle of treatment resulting from replacement of fresh embryos only.

"But that's a bit like telling people what their chances of getting to Edinburgh are if their ultimate journey is to London.

"What this new model does is give the patients and doctors a much clearer idea of what they can expect through this long, complicated and often stressful journey."

Kayleigh Taylor believes the new calculator will help removed some of the unknown.

"I think it would definitely give you a better perspective. It gives people an insight into what their chances are overall," she said.

Cathy Marston, meanwhile, is getting used to the idea she is unlikely to have more children.

"I'm still at the place where tears are never that far behind. It has taken a long time to accept IVF hadn't worked for me".

The Taylor's fertility story had a happy ending.

For other couples looking for the same, at least it looks as if they can now have a better idea of just what their story could look like.