YES. You can. You have to build up a level in your system. You shouldn't be in such a hurry to have sex. You can still get pregnant being on the pill. The only birth control that works 100% is abstinence.
Please read the directions! YES, you can...depending on when you started taking them..if you take them on the SUNDAY following your menstral cycle, then no...you don't have to use a backup contraceptive....too make a long story short..Use protection the first month...and save yourself some grief.
Um, I'm sorry but there is NO method that completely PREVENTS the chance of getting pregnant at any time. It just lessens it. And yes, you CAN get pregnant on your first day of using the pill. The drug needs time for it to work into your system more. The pill prevents you from releasing the egg, so wouldn't it make sense to give your body time to build up the mucus lining your cervix?
I suggest you at least have a back-up plan for a while (i.e. condom).