The pair had previously been considering having a winter wedding in 2012, but the Big Brother star confirmed that her pregnancy has made that an unlikely prospect.
"It looks like being summer next year instead," said Houghton, according to Now.
"I don't want to be in the gym, hammer and tongs, trying to get fit for my wedding. I want to take it slow and not do everything at 100 million miles an hour for once."
Speaking about her fiancé Reid having sent messages to Amy Willerton, the winner of his ex-wife's Signed By Katie Price programme, Houghton said that the incident had caused tension in the couple's relationship but that they are "nowhere near" breaking up.
She confessed: "We did argue, we didn't speak for a few hours. He did stay at his mum's one night.
"I just said to him, 'You are so stupid to bother messaging that woman back'. I told him he was an idiot."
> Chantelle Houghton: 'Amy Willerton wanted Alex Reid message publicity'
> Alex Reid regrets Amy Willerton message: 'I'm committed to Chantelle'