Just to make sure you get really clear information out of this thread, I'm going to chime in. Everyone that said you have next to no chance of gaining an acceptance without a bachelor's degree is correct. Maybe 1% of all of the matriculants in the country each year have no degree (this data for the entire country is not published to my knowledge and thus is based on the MSAR's data for each individual school). My impression is that most of those students have some sort of outstanding scholarship or other extenuating circumstances that makes them as competitive as a student with a degree. Unless you have something similar, your chances are not good.
That being said, as BK611 pointed out, most students will apply to medical school the summer between their junior and senior years of college. Interviews typically happen during fall/winter and into early spring of senior year, and those students who get accepted will matriculate during the fall after they graduate. These students have applied without a degree, but gained their degree during the application process. This is entirely acceptable and won't put you at a disadvantage compared to other students.