The 42-year-old singer and the 'Transformers: The Last Knight' actor, 45 - who have four-year-old son Axl together - called time on their eight-year marriage earlier this year, but she has admitted the break up came somewhat out of the blue as they had been discussing extending their family before things crumbled between them.
Speaking to The Sun newspaper's 'Bizarre Life' podcast, Fergie said: ''It was a conversation about, 'OK, do we start our next baby or start a new album?'
''I knew I didn't want to do them at the same time. It's too much, you know?
''A child is something you have to focus on and make sure everything's padded around them -- not put all the other pressures on top of having a second child and doing an album, that's just ludicrous to me. Josh was actually the one who said, 'You know what, you should go back into the studio and make some music'.
''I remember crying a lot of times going into the studio because it was so hard to leave my kid. It was just this weird feeling I've never felt in my life before. I was like, 'What is this mummy guilt? What the hell is this?' So it was quite awful sometimes.''
The split meant Fergie had to push back the release date of her new album 'Double Dutchess', which marks her return as a solo artist, because she was trying to deal with her emotions, but it was made even harder by the fact she couldn't tell anyone.
She explained: ''You're a human being, we're not robots.
''Emotions are going to come to the surface. I couldn't tell everybody, 'Oh hey, guess what, the album's taking so long because I'm going through some stuff right now'.
''Some days are better than others and we're both working really hard right now on our careers. We're both full-time and very ultra-loving parents. We're really trying our best to make sure Axl feels filled with love and that we are his parents.''
And, although they are getting on well and co-parenting their little boy, the former couple have no plans to rekindle their romance at this moment in time.
She added: ''So many things have happened in my life, I would never say never, but right now we are not thinking in that direction.''
Janelle Monáe parties and drives with her girl squad in the video for her latest single 'Crazy, Classic, Life', taken from her album 'Dirty...
Continuing the softer sound of their 2015 release 'That's the Spirit', BMTH are about to release 'Amo' (January 25th 2019) featuring their newest...
To coincide with the new BBC mini-series adaptation of leporine epic Watership Down, Sam Smith has unveiled a new single entitled 'Fire on Fire'.
Her first single since leaving the jungle on 'I'm a Celebrity... Get Me Out of Here!', Fleur East drops the super-choreographed video for 'Favourite...
Dropping the video for his latest album's second single, 'Excuses', is Olly Murs just months after the release of 'Moves' featuring Snoop Dogg.
Professor Green and Rag'n'Bone Man have teamed up for a heart-wrenching video for their single 'Photographs'.
He released 'Everythang's Corrupt' last month, and now Ice Cube has dropped a video for the record's third single 'That New Funkadelic'.
Dappy has unveiled a new stripped down number entitled 'Count On Me' more than six years after the release of his debut solo album.
Marmaduke is perhaps the world's most famous Great Dane, he was originally brought to life...
Planet Terror Trailer Robert Rodriguez, co-director of Sin City, brings you Planet Terror, a retro-futuristic...
Longtime buddies Quentin Tarantino and Robert Rodriguez have worked together before (Four Rooms, Sin City),...