Before the track Sorry, Beyonce sings:
"So what are you gonna say at my funeral now that you've killed me? Here lies the body of the love of my life whose heart I broke without a gun to my head.
"Here lies the mother of my children both living and dead. Rest in peace my true love, who I took for granted."
She later talks about giving birth via C Section.....
"The nail technician pushes my cuticles back, turns my hand over, stretches the skin on my palm and says: 'I see your daughters and their daughters'.
"That night in a dream, the first born emerges from a slit in my stomach. The scar heals into a smile. The man I love pulls the stitches out with his fingernails.
"We leave black sutures curling on the side of the bath. I wake, as the second girl crawls head first up my throat. A flower ... Blossoming. Out of the hole in my face."
Jay, previously rapped about the miscarriage on Glory, released soon after the birth of Blue Ivy in January 2012.
He rapped: "Last time the miscarriage was so tragic / We was afraid you'd disappear / But nah baby you magic."
Beyonce talked about the miscarriage in a 2013 documentary called Life is But a Dream, describing it as "the saddest thing I've ever been through".