The glamour model explained on Twitter that the discovery had been made ahead of a planned boob job.
"Thanks 4 ur support had a scheduled breast op but Dr's found a blood clot & I lost lots of blood so now having a transfusion am in good hand & I will hopefully be home to my family tomorrow scary times love my family so much Xxx (sic)," she said.
"Thanks to everyone who donates blood I feel so much better today. Xxx Also people might think am selfish 4 wanting a boob job but if I didn't have an op they wouldn't have found the clot & I could of died!"
Asked if she eventually had the cosmetic procedure, Lloyd added: "No I didn't sadly I haven't been able to have anything now which is very upsetting!x
"I couldn't have the op & my implants removed as it was 2 dangerous so now I have 2 hope I get better 2 have them replaced before my wedding."
Lloyd is engaged to footballer Jamie O'Hara, who is the father of her two children Archie and Harry.
Last December, Lloyd had to take Harry to hospital after he suffered from breathing problems.