What do you think about this birth control??please please try to answer..soo confused about my body?

I had real bad pms symp, so i though i might have been preg. but then i started my period on a thurs, stopped sat night, so i started my BC on sunday(the new yaz)..and since my period stopped i've still been having cramps, and really sore breasts, headaches everyday, i only took the pill sun, mon, and tues...and i thought if that BC was causing it,didnt want to take it anymore, so i havent taken it for 2 days and still my breasts are really sore, and still cramping, but now a little nauseated, but that could be somethin going around, so i'm just wondering do you think if i'd only been taking the pill for 3 days that i would already have bad side effects from it, or does it take longer? so these symptoms could be from something else? i dont know what to think? also my back HURTS..most of the day, the whole thing, neck to tailbone...but while these sound like it might be preg..even if i had a short period, its unlikely..we use condom&pull out(same time) always,so what else could it be?What do you think about this birth control??please please try to answer..soo confused about my body?
Ok I used to be on the pill because i had periods like your having now. The pill regulated my periods and also made them less painful. I was on bc for 3 years and i switched mine twice because of the side effects. I don't think your pregnant if you used condoms and are on bc. Your symptoms may just be an effect of the type of pill your using. You might wanna ask your doc to switch you to a different bc pill. I hope i helped in some way.
Call your Gyn. Only he/she can help you with this.