my period was due on 9th may but it didn't start, instead i had severe cramping on 9th morning. I thought period will start.but it didn't.n den after some hours there was no cramping as well. i've had protected sex in January,2015 and since then I had 4 periods..but this months' period didn't start..m scared? IS THERE ANY CHANCE OF PREGNANCY? or for hw many days period can be late??