Khloe Kardashian is worried she's too stressed to get pregnant.

The socialite - who has made no secret of her desire to have a baby with husband of two years Lamar Odom - is struggling to conceive and thinks the pressure placed upon her could be affecting her chances.

In a scene from her reality TV show 'Khloe and Lamar', Khloe hits back at sister Kim who suggests she and the basketball star try in vitro fertilisation (IVF), saying: "Yeah, I do want to have a baby. Being proactive with it is one thing ... If it's meant to be, if it's meant to be.

"Maybe when I'm away from all of you stressing me out a baby will come. Everyone gives me s**t about not being pregnant. Stress makes people not get pregnant."

Khloe, then phoned other sister Kourtney - who is currently pregnant with her second child - to vent her anger about Kim.

Kourtney replied: "Everything happens for a reason. I think that timing is everything. I'm sure she's just trying to help."

However, Khloe soon realised she had over-reacted and apologised to Kim.

She said: "I wanted to say I'm really sorry for getting so mad earlier. I get really sensitive about pregnancy and in vitro and everyone thinking there's something wrong with me."