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Cardi B is adding quite a bit of fuel to those raging pregnancy rumors ... publicly declaring on national TV that she wants more kids.

Check it out ... the rapper stopped by "The Jennifer Hudson Show" Tuesday, where she talked about her home life with kids Kulture , 7, Wave , 4, and Blossom , 1.

While she joked about having too many kids at home, Cardi told Jennifer Hudson she definitely plans to add to her brood ... as it's part of her retirement plan.

She explained ... "The more kids you have, the less of a possibility you go to, like, a home. One of them is gonna wipe my butt."

Jokes aside, Cardi's confession only further adds to the speculation that she's expecting her 4th little one.

Remember, the Grammy winner appeared to sport

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