"Call the Midwife" has yet to showcase the many challenges that the midwives and sisters of the Nonnatus House face.

The episode that aired last week featured a case of a single woman who is carrying the child of a married man. On top of having to look after newborns and making sure pregnant ladies have safe deliveries, the midwives and nuns dealt with this case that obviously goes against their morals.

But more of those challenges will come as the society is changing with times and the nuns and midwives will have to learn how to adapt.

As stated in the synopsis found at BBC One, "Sister Julienne (Jenny Agutter) is impressed by the medical advances that are saving the lives of mothers and babies. But a traumatic birth raises moral questions for her which she struggles to answer."

The medical world is rapidly changing and so is the society. Educational opportunities become open to everyone. Although Ian (Ted Reilly) belongs to the working class, he was thrilled to receive the news that he got accepted to a university and he sees it as an opportunity to finally get out of Poplar.

His mother, Sadie (Hayley Carmichael), is a more traditional person and would like for him to stay, and it might just happen because Ian's plans will be ruined when he learns that his girlfriend, Linda (Chloe Harris), got pregnant.

Tom (Jack Ashton) and Trixie (Helen George) step up to help the family deal with the situation of an unplanned pregnancy.

While the characters are busy dealing with different cases of pregnancy, Jessica Raine, who plays Jenny Lee in the series, also has a pregnancy of her own to deal with.

Mirror reported on Saturday that the star may need to call her own midwife because she is said to be five months pregnant with husband Tom Goodman-Hill.

Catch more of Jenny and the rest of the midwives and nuns in "Call the Midwife," every Sunday at 8 p.m. GMT on BBC One.