What Causes White Rubbery Discharge From The Vagina During Periods?

Hi, I am 25 years old female, my height is 5 feet and weight is 45 Kgs, I have no previous medical history. I had sex during second week of dec'2011 and got my periods delayed by 30 to 35 days, i did pregnancy test which came negative, my doctor recommended me cycloreg tablet one for three days for my delayed periods, after having it i got my periods but in my first day i saw some off white fluide which was not very sticky.Also there was a rubber like material that came along with blood. Is thr any chance i might be pregnant?