The latest twist for the Walford couple airs next week as Max is stunned when Kirsty (Kierston Wareing) tells him that she is pregnant with his child.
Kirsty's revelation comes just as Max is feeling uncertain about their future as a couple, still secretly hoping to reconcile with on-off partner Tanya (Jo Joyner).
Wood told All About Soap of Kirsty's bombshell: "Max is shocked - deeply shocked. Obviously she was pregnant once before when he left and she had to abort the baby because of Derek, and Max knows how upset she was about that.
"But this is a massive surprise he just didn't see coming. It's completely out of the blue as far as Max knows."
The actor continued: "He wants to tell Tanya and the girls first to make sure there's no upset for them, but Kirsty isn't keen when he suggests it!
"He didn't plan to have kids with Kirsty for a very long time, not while he's unsettled and determined to get Tanya back. It's the last thing he wanted to happen, I think."
While Kirsty is determined to make her marriage work, Max continues to wonder whether Tanya really is the right woman for him.
Wood added: "If they decided to have the child, I think Max would be committed to the baby, plus Kirsty would be a great mum. Max is a good dad, and it must be very frustrating for Kirsty, because he won't commit to her fully.
"He's playing for time and doing that typical Max thing where he's trying to keep all the balls in the air until he's got something properly sorted.
"At this point, I think he would be happiest with Tanya, but she won't have him back. He isn't in control at the moment - everything is out of his hands and he hates that.
"He wants to be with Tanya and if he could return to Christmas when they were about to get married again, he would. Only this time, there wouldn't be his other wife knocking at their front door!"
EastEnders continues tonight (March 26) at 7.30pm on BBC One.
Digital Spy Soap Scoop video - press play below to watch Amie Parker-Williams reveal the gossip on a Coronation Street death, pregnancy news in EastEnders, a surprise disappearing act in Emmerdale and a secret being shared in Hollyoaks.