I'm starting my BS in Cellular and Molecular Bio next spring
Ok, so, let's say you take 4 classes a semester (conservatively!). Let's say each class is 3 hours of class, and let's say 2 classes are lab sciences (for example, a genetics class, or a physics class) of 3 hours apiece.
Now, you're up to 12 hours of class plus 6 hours of lab. Each hour of class, conservatively, should convert to *at least* an hour of study time. So, now we have 12 hours of class, plus 12 hours of study time (minimum, and I hesitate to mention - myself, I usually took 2 hours of study time per hour of class), plus 6 hours of lab. That's 30 hours of class, lab, and studying a week.
Add in your paramedic program, and it's going to be unmanageable.
You are so much better off doing a 4 year degree and doing well, while working part time as an AEMT than you are doing a 4 year degree and doing poorly, while studying for your medic.
No question about it.
As far as money goes, doing your bachelors degree in four years (or less) and starting medical school sooner than later is the best financial decision you can make. The earlier you start making an actual physician's salary (remember: that's four years of college plus four years of medical school plus three years of residency - minimum - from now), the better.