Standing in my bathroom, the luxurious marble tiles cool under my feet, I stare at the test in my trembling hand. The second line is unmistakable: I'm pregnant.

This is all my husband Theo and I have ever wanted, but I didn't think it was possible. I should be excited, but all I can think about is telling my stepdaughter.

Because Ellie's always hated me, ever since she realised it was no longer just her and Theo. Now she's seventeen, beautiful and smart - smart enough to see through me. And if Ellie decided to uncover my secrets, it wouldn't be just my marriage at stake... it would be my life.

But I've been so careful burying my past. There's no way she could learn the truth. I know stress isn't good for the baby, so I force myself to relax.