Condoms suck, the pill rocks, and pulling out has never failed me (maybe I'm sterile?)
But at the end of the day this is all a moot point and it has nothing to do with babies: It's called HIV and about 1 in 200 people have it (I know know, most of them are in Sub-Saharan Africa but still).
That's not something you fuck around with (no pun intended). Don't be stupid, if you're hooking up with shady girls at parties or bars when you're drunk, wear a condom.
If you think waiting a couple weeks to find out if she's pregnant or not is bad, try waiting for the results of an HIV test. I guarantee it will be the most agonizing period of your life.