Shelagh and Patsy both face tough challenges in this week’s episode of Call the Midwife.

She may be suffering from morning sickness, but that doesn’t stop Shelagh from proving her mettle when an explosion blasts through a warehouse. After she helps the injured, the usually timid doctor’s wife speaks out boldly about health and safety.

There’s a tough time in store for Patsy, too. Torn as to whether she should visit her ailing father, she helps Penny and Derek, a doting couple with achondroplasia, a form of dwarfism, who are having their first baby. Medics warn them not to expect a happy outcome, but Penny wants to prove them wrong…

Meanwhile, Sister Ursula continues her reign of terror, unleashing a rebellious side of the nuns and midwives!