The factory worker, played by Jennie McAlpine, shares her happy news with husband John (Graeme Hawley) shortly after the troubled teacher's dark new plot involving the demise of Colin Fishwick kicks off, according to reports.
As previously revealed, Colin is to end up dead later this summer following a heated clash with John. In the aftermath of the tragedy, John is expected to conceal his former friend's body by burying it beneath Underworld.
Fiz, however, is completely unaware of the sinister events and is thrilled at the thought of family life with her partner.
Departing character Natasha Blakeman (Rachel Leskovac) is also expected to become involved in the storyline. After having an abortion in secret, the hairdresser reportedly panics when her baby's father Nick Tilsley (Ben Price) asks to see the child's scan, prompting her to ask Fiz to lend her own.
A Weatherfield source told The Sun: "Fiz is over the moon about her pregnancy and feels for Natasha. But she might wish she was the one who had the abortion when she finds out what John has done."