A woman who was fired by her employer after becoming pregnant started the campaign, which is called Pregnant Then Screwed.
The campaign aims to raise awareness around the shocking facts that 54,000 women are sacked for being mothers every year as well as raise money to fund the campaign, which hopes to build a case for the Government to lobby on.
It's also been revealed that 40% of employers would avoid employing a woman of child-bearing age.
Founder Joeli Brearley says, 'we need your help to end pregnancy and maternity discrimination. Together, we can stop mothers losing their jobs for getting pregnant.'
Catherine is mum to Alfie, her two-year-old son who she shares with husband Tom.
The Coronation Street star is just one of the celebrity mums lending her support to the campaign, appearing in a video to reveal that 77% of mums endure negativity or discriminatory treatment in the work place.
The mum-of-one tweeted her support at the weekend, writing 'Support @PregnantScrewed to help more women who lose their job as a result of being pregnant. Video featuring me!'
Catherine appearing in the Pregnant Then Screwed campaign video
Catherine can lend her support from a personal perspective as she had to take maternity leave from Coronation Street two years ago when giving birth to her baby boy.
The actress gave birth to her son back in March 2015 and took maternity leave from the show from the end of 2014, not returning back to her role as barmaid Eva until autumn 2015.
Helen Skelton has also given her support to the campaign, appearing alongside Catherine in the Pregnant Then Screwed video.
The television presenter is mum to a little boy called Ernie, whom she shares with husband Richie and gave birth to in July 2015.
Have you ever felt pregnancy pressures from your work place, or suffered discrimination for being a mum or wanting to take maternity leave? Tell us in the comment box!