Khloe Kardashian never anticipated how difficult it would be to conceive a child with husband Lamar Odom.

Appearing on 'Good Morning America' with her sisters Kim and Kourtney, the 28-year-old reality star admitted she ''never knew all the difficulties'' associated with trying to get pregnant.

She revealed: ''My mum has so many kids, and Kourtney pops them out like a PEZ dispenser, so you think it's, like, so easy. You realise it's not as easy as you might think.''

Kourtney has a son, Mason, two, and a daughter, Penelope, two months, with partner Scott Disick.

In an episode of 'Keeping Up With the Kardashians', Khloe visited a fertility Clinic with Kim.

Khloe said that learning about a woman's body along with viewers was tough.

She admitted: ''It was really hard to show what I was going through. I feel like I'm helping a lot of people, but I'm still figuring it out for myself.''

Khloe - who married her basketball player partner in September 2009 after a one-month engagement - has continued to undergo fertility treatments in Hope of one day starting a family.

However she emphasised there is no way of making sure it works.

She confessed: ''It's trial and error. You got put on hormones and see if they work, and if they don't, you move to the next step.

''There will be a part two coming up to this season. You will find out more of the in-depth treatments that I've been doing, but it's really trial and error.''