The 36-year-old is currently pregnant with their third child, a boy, and are already parents to Theodore (3) and Gigi (1).
Speaking to Mail Online she said she isn’t sure if she will have more kids or not.
“Spencer would go for four children,” she said.
“I have to be pregnant so he leaves the decision to me, but he would be happy with five or six but no thanks. We won't be doing that!”
“I'm not sure this pregnancy will be my last because I have suction bagged all of Gigi's clothes and I thought 'Why am I doing that?'
“My intention with all her clothes was to sell them to charity and I haven't done that, and they are girl's clothes and I'm not having a girl... I will leave it an extra year and then I'll decide.”
The expectant mum, who is due her third baby in April said that her house is always busy with children.
“Of course, it is a little bit daunting to have three, but our house is never quiet anyway, so we're used to being up at 6:30am every day and we're embracing the madness and I like that it's happening all at once.”
The fitness fanatic has also vowed not to pressure herself to ‘get her body back’ after giving birth.
“I wouldn't put pressure on myself to get my body back and as well if you're breastfeeding, you must be careful about what you eat, and I've never been one to diet.
“I try being as healthy as I can but when you're breastfeeding all you want to do is eat cake and I don't know what it is, you just need the sugar.”
She is however planning to continue her fitness routine until she goes into labour.
“Someone asked me yesterday when I will stop training and I said, ‘Well it depends on what I'm doing the day when I give birth.’ I'll be training right up until the very end because I think if you feel up to it then you might as well do it.
“'I wouldn't train if I didn't feel like it,” she explained, “so I judge it like that.
“I never regret a training session. I have trained for so long I know what I can and can't do when I'm pregnant.
“I do a lot of weights – that's the funny thing as well, people will see you picking up a bag and they're like ‘don't do that’ and I'm thinking ‘I was just squatting weights, I am able to pick up the bag.’ I can kind of still sit in the exercise bike but it's a little uncomfortable, so it's mainly weights and resistance bands now.”
“I feel body confident,” she added.
“Rihanna is the best and I love what she's doing. Pregnancy style can be cool, you shouldn't feel like you have to cover up and Rihanna has been brilliant in that and I love her pregnancy style.”