Birth control question?

So im just wondering what your opinions are. I was on birth control for only a month but had to stop the last four active pills because they were making me sick. and then the next day I had my period for three days whens its normally 4-5. I usually have a 28 day cycle but now its 7 days (now going on a 35 day cycle) past when I should have gotten my period. I don't believe I have any thing to worry about (using the pull out method after I stopped the pill) but is this normal for the period to be pushed back or should it arrived on time? I'm just guessing my period has been out of wack because I stopped the pills early, but I'm not sure. Any opinions are helpful, thanks!