The EastEnders actress, 32, had daughter Dusty last year, following two previous miscarriages, both at seven weeks.
She told OK! magazine that she is 16 weeks pregnant.
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“We feel so lucky to be expecting our second baby, as it took so long to get Dusty,” she said.
Turner, who plays Stacey Slater in the BBC One soap, added: “I was over the moon. I had an inkling I was pregnant, so I took the test at home and it was positive.”
The actress, who is married to Matt Kay, said: “We feel so lucky… as it took so long and there was so much heartache getting Dusty here.”
And she added: “After the heartbreak we went through, it’s a miracle to fall pregnant so quickly.”
Turner met her husband as teenagers and the pair married in Ibiza in 2017.