Tina is currently carrying a baby for Gary Windass (Mikey North) and Izzy Armstrong (Cherylee Houston), but Tommy soon leaves her "very upset" by suggesting that she could still have an abortion.
Viewers will see Tommy (Chris Fountain) become increasingly concerned about Tina's pregnancy when she suffers from severe morning sickness in upcoming episodes, and matters later come to a head as she suddenly collapses.
Keegan told All About Soap: "Tina passes out, but is quite laid-back about things. However, Tommy's in a panic and he doesn't want Tina to be pregnant anymore because it's risking her health.
"They call Doctor Matt, Tina's ex - not awkward at all! They find out Tina's anaemic, which is quite common, but Tommy's worried."
Tommy feels even more unhappy when local gossip Norris Cole (Malcolm Hebden) discovers that Tina is pregnant and spreads the news around the Rovers Return.
When a surprised David Platt (Jack P Shepherd) then recalls how Tina had an abortion during their own relationship, Tommy is given food for thought.
Speaking of David's antics, Keegan added: "[Tina's] definitely not impressed. It was years ago, she was a lot younger then and wasn't ready to be a mum. Now that David's told Tommy about it, Tommy thinks abortion is an option, and Tina's very upset about it all."
Tommy later piles on the pressure for Tina to end her pregnancy for the sake of their relationship, leaving her with another impossible decision to make about her future.
Coronation Street airs these scenes in early December on ITV1. Get the Inside Soap magazine on your iPhone or iPad