Stressing out over a possible pregnancy, could actually cause you to have an irregular period. Try to relax and don't spend all your money on pregnancy tests, it's too soon yet. I suspect that since you are having cramping, you are getting ready to have your period. If you are just too worried to wait this one out, you could go to your local health Dept and request the "morning after pill". Also called Plan B. It's most effective the sooner you take it, but can work, up to 72 hours after sex. No, it will not make you miscarry, if you are already pregnant. Good luck!
Well as of yesterday I had thought I was starting my period. I had awful cramping (normal) and really bad backaches, also normal. But still no bleeding, until about 7pm and there was light blood when I wiped after using the restroom and then around 9pm when I used the restroom again, it was the same result, but still nothing in the toilet... Now I'm up this morning at 6am, used the restroom and there is nothing anywhere. I'm not really sure what this means. I've never had an irregular period or a light/missed period.