Me too - the worst cramps ever. I spent the first 12 weeks of my pregnancy not daring to believe i was really pregnant (even tho i had bad ms lol) cos the cramps were so bad i felt like my period was gonna come for the first 6 weeks. I also bleed at just before 5 weeks and thought omg this is it i'm not pregnant anymore. But nope apparantly it is really common to have a bleed early on. I think your body must forget your pregnant or something and wanna give you a period but then remembers lol.