Tired of accumulating sentimental relationships that lead to nothing, Federica decides to be a single mother, on her own. He asks his best friend to be the donor. After all, she says, he is the most honest, caring and honest man she knows. In addition, science allows you to get pregnant today without even having to have a sexual encounter. In the third month of pregnancy, she finds out that the baby she's expecting doesn't share her DNA. She goes to the clinic where she underwent an fertilization treatment and they acknowledge they made a mistake by exchanging her embryo with another couple's, Fabiola and Alonso, who has been trying for some time. The clinic identifies the woman into whom they implanted her embryo, but she suffered a miscarriage. She decides to go on with her pregnancy, have and keep the baby, but the biological parents will struggle to get their baby back.