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And now, in an unseen clip, we could get a clue about what the argument is about.
You can watch the video below:
The clip begins with Adam and Tayah, and Morag and Luke, at the next dinner party. Luke says: "You always seem on the same page you two."
To which Tayah replies: "You know what we've been talking about, this time next year I'll be pregnant."
"Don't drop that bombshell," says Adam. "She's not pregnant by the way... she's having visions of it... we've not properly agreed that's going to happen by the way, she's just having visions."
And Tayah looks visibly upset by Adam's comments, meanwhile Adam also seems pretty uncomfortable at the idea and reaches to sip on his drink.
At the end of Monday evening's episode, a preview to Tuesday's instalment showed Tayah telling Adam she wasn't happy with him.
It's unclear what their row is about, but could the baby plans have something to do with it?
It'll be the first argument for the couple, who hit it off instantly and said 'I love you' after just five days while still on their honeymoon.
We're sure these two can work it out!
Meanwhile, in other MAFS news, on Monday we showed you Nikita's reaction, after she learned Ant and Alexis had been flirting at the first dinner party.
Speaking on an Instagram Q&A, Nikita spilled the tea about what happened behind the scenes on MAFS, and what she made of Alexis and Ant as a twosome.
She said: “I mean it's not the nicest thing to watch let's be honest.
“I'd obviously walked out of the dinner party at this point straight after I stuck up for Alexis with Jordon (this went on all day BTW the dinner party took like 12 hours to film, you only saw ten mins at the end).
“I feel like as soon as I left my grave was filled each to their own, I wouldn't do that to her but I was baffled by it because there was no flirting going on at all when I was there, it was the first time she had met him.”
During Monday's ep, Alexis and Ant - who last week left the experiment - returned to the show to ask the experts if they could rejoin the process as a dating couple.
But will the experts allow it? We can't wait to see what's next for these two!
Married at First Sight airs Monday to Thursday at 9pm on E4.
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