The singer, who recently confirmed that she is expecting a baby boy with boyfriend Sam Cooper, previously suffered a miscarriage with her first pregnancy and has worried that history could repeat itself.
The 24-year-old told The Sunday Times: "I came off the pill and, weirdly, a week later it happened. But then it was really difficult, I had complications.
"I had about a week and a half of really heavy bleeding and had to have lots of scans... I’ve been living in fear for the past three months."
Last month, it was reported that Allen is planning to marry Cooper in the near future.
