starting birth control

my mom and i decided its time for me to start birth control. im not sexually active but my mom wants an "insurance policy" just in case me and my boyfriend decide to make that step in our relationship, even though i dont think we will any time soon. i started my period friday so i began to take it the following sunday. im so unsure of what to expect. any tips? i may end up stopping after three months (thats when i go back to my doctor to talk to her about how i like it). should i stick with it if i dint notice any changes in my body? (im always pretty aware of whats going on)