Ay, I'd really suggest checking with your OB about this one, sis, kahit common ang delayed period sa birth control, 9 days is worth confirming, especially since kakapanganak mo lang in December at first time mo gumamit ng Diane. A few of us tried different pills and it took our bodies a while to adjust, pero some had spotting or skipped periods din, kaya better safe than sorry talaga with post-partum stuff.