I started yasmin because of bad PMS and heavy periods, leaving me...

I started yasmin because of bad PMS and heavy periods, leaving me very weak for days. Only really had one good week a month, so i thought i'd try this pill (never having used BC pills before) after it had been recommended by two friends of mine. Now, i've only been on it 8 days so it may be a little early to start complaining but my main concern is that my period has not stopped. I took my first pill on the day my periods started for the month and where they would usually last 4-5days max, i am now on my eighth day and there's no sign of them stopping! Not heavy, light and dark like the last couple of days before the end of your cycle - only im usually onlly like thsi for a day or two before they finish... this time they dont look like they're finishing!!! Also have swollen, sore breasts (that i can tolerate - have gone up a cup size!). Have found im going to bed earlier and waking up a lot easier since i started the cycle, which id a plus as i usually have a hard time falling asleep and waking up. Mainly concerned about the constant bleeding as have not seen it mentioned as any one elses symptoms. has anyone else experienced this? if so, is it normal for a first-timer? I thought it may be because its the first time i have taken BC pills and it takes a couple of months for your body to adapt... Any feed back would be greatly appreciated :-)