Later on in Peggy's, Don is looking to win back his ex-partner and puts on a lavish performance in the bar.
Sam is then left stunned when her old flame goes down on one knee but she also has a bombshell to share with him too and tells Don she's pregnant.
She then tells Zack about the news, who is also shocked, but leaves him something to think about.
Could Sam really be pregnant and is Zack the father or is someone else responsible?
EastEnders airs Monday to Thursday at 7.30pm on BBC One and BBC iPlayer
Later on in Peggy's, Don is looking to win back his ex-partner and puts on a lavish performance in the bar.
Sam is then left stunned when her old flame goes down on one knee but she also has a bombshell to share with him too and tells Don she's pregnant.
She then tells Zack about the news, who is also shocked, but leaves him something to think about.
Could Sam really be pregnant and is Zack the father or is someone else responsible?
EastEnders airs Monday to Thursday at 7.30pm on BBC One and BBC iPlayer