Ed Sheeran has spoken out after being swept up in the abortion debate when his song Small Bump was used in a pro-life ad campaign.

The pop star took to his Instagram to make it perfectly clear that his 2012 hit was used without his permission, saying the song does not reflect the message of the campaign.

On the text post, Ed revealed that he had only recently been made aware of the song's use and wanted to clear things up for his fans.

The Shape of You hitmaker wrote: "I've been informed that my song Small Bump is being used to promote the Pro-Life campaign, and I feel it's important to let you know I have not given approval for this use. It does not reflect what the song is about."

Ed Sheeran's Insta-story post. Photo / Instagram
Ed Sheeran's Insta-story post. Photo / Instagram

The song, which featured on his album +, is reportedly about an expecting parent having to deal with a tragic stillbirth.

The hit includes lyrics like: "You're just a small bump unknown, you'll grow into your skin / With a smile like hers and a dimple beneath your chin.

"Finger nails the size of a half grain of rice / And eyelids closed to be soon opened wide / A small bump, in four months you'll open your eyes."