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you can't be just a little bit pregnant 

It means that the situation that is being described is a binary. It is something that is either IS or ISN'T. Such as is the case when one is pregnant. One either "is" pregnant or "is not", there is no in between or partial pregnancy. It means it is a situation in which there is no ambiguity or no gray area. You can't be "just a little bit" of certain things.
You can't be just a little bit pregnant when you are talking bankruptcy. You can't be just a little bit bankrupt. You are either bankrupt or not bankrupt.

References:
Lou Mannheim (Hal Holbrook) in the movie "Wall Street" used this phrase while conversing with Bud Fox

It's fun, calorie-free, and won't get you pregnant 

A good line to use wif a cute chick when ya wanna do something totally "innocent 'n' harmless" like rub her feet, give her a cuddly soothing massage, etc.
Telling a hot gal dat "It's fun, calorie-free, and won't get you pregnant" can also be effective for getting her to allow you total access to her warm softness wif your hands and lips, provided dat you are actually able to "keep it in your pants" (or at least just in her hand or mouth, if you're both naked). Good luck wif DAT, though --- once you get excited from savoring her exquisite flesh, her juicy-looking coochie may look awfully tempting for your painfully-engorged lulu! What you can do in dis case, though, is to either wear a condom or have her "relieve da pressure" manually/orally, and then you can safely thrust inside of her for at least a few minutes before your sperm-glands "recharge themselves" to da point where you would again be in danger of spurting helplessly while you're eagerly "soothing her baby-tunnel" wif your swollen "love-pipe".

It's easy, fun, free, legal, calorie-free, and won't get you pregnant

How you describe a proposed recreational activity to a girl to alleviate most of her "automatic" (i.e., uncertainties that would typically occur to her "right off the bat" whenever anything unfamiliar is suggested to her) concerns .
Telling a cutie that, "It's easy, fun, free, legal, calorie-free, and won't get you pregnant" when you wanna give her an "all over" massage is fine and dandy,. but how can you be so sure that this will all be true? I mean, just **you** try and "keep it in your pants" when you have a luscious-fleshed girl lying naked and submissive in front of you!

am I pregnant test 

an annoying ad urban dictionary wants you to click on
Why is urban dictionary keep showing me this "am I pregnant test" ad?
I wonder how much money they sponsored

Pregnant Teen 

A pregnant teen is a dead motherfucker, that's what.
"Molly is a pregnant teen but when her mom finds out, she's gonna be a dead SOB."
Pregnant Teen by Not_His_Anymore November 5, 2018

Pregnant tree 

A tree that has a large, round, protruding growth from the stump.
"Wow, that's a pregnant tree if I ever saw one!"
Pregnant tree by ¡EVA! December 9, 2008