Jessie J has said her 'sadness is overwhelming' as she shares a heartfelt message to her fans after suffering a miscarriage.

The 33-year-old singer shared the news to Instagram, posting a picture of her holding a positive pregnancy test with the location tagged as "heartbroken" before telling her followers that she had been pregnant with a baby "I decided to have on my own."

"Yesterday morning I was laughing with a friend saying 'seriously though how am I going to get through my gig in LA tomorrow night without telling the whole audience I am pregnant," she captioned the image.

"By yesterday afternoon I was dreading the thought of getting through the gig without breaking down... After going for my 3rd scan and being told there was no longer a heartbeat."

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The second image on her post featured a quote from Seyda Noir, which read: "Sometimes love won't be enough to make it work, and that's ok. It doesn't mean that you've failed."

Jessie shared that she will go ahead with her scheduled concert as she hopes it will help her.

"I feel like I have no control of my emotions. I may regret posting this. I may not. I actually don't know. What I do know is that I want to sing tonight. Not because I'm avoiding the grief or the process, but because I know singing tonight will help me," she said.

"I have done 2 shows in 2 years and my soul needs it. Even more today. I know some people will be thinking she should just cancel it. But in this moment I have clarity on one thing. I started singing when I was young for joy, to fill my soul and self love therapy, that hasn’t ever changed and I have to process this my way.

"I want to be honest and true and not hide what I’m feeling. I deserve that. I want to be as myself as I can be in this moment. Not just for the audience but for myself and my little baby that did it’s best.

She continued, "I know myself and I know I would talk about it on stage because that’s who I am. So instead of a tearful emotional speech trying to explain my energy. This feels safer.

"I decided to have a baby on my own. Because it’s all I’ve ever wanted and life is short. To get pregnant was a miracle in itself and an experience I will never forget and I know I will have again.

"I'm still in shock, the sadness is overwhelming. But I know I am strong, and I know I will be ok. I also know millions of women all over the world have felt this pain and way worse. I feel connected to those of you I know and those of you I don’t. It’s the loneliest feeling in the world. So I will see you tonight LA. I may crack less jokes but my heart will be in the room."

Taking to her Instagram stories, Jessie thanked her fans for their support.

"Your overwhelming instant out pour of love is felt, received, and appreciated beyond measure. And has got me out of bed this morning. Thank you," she said.

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