Hi, my period was due on the 10/2/12. I did a clear blue pregnancy test on 13/2/12 which said pregnant 1-2 weeks. My periods are very regular and never late. I have however had stomach cramps since the 11/02/12 and have been bleeding like a period since last night. I did the same pregnancy test this morning which said not pregnant. I'm really confused was I ever pregnant and am now having a miscarriage or was the positive test an error?

It is common enough to have menstrual bleeding after pregnancy starts, and it is not uncommon to have a false positive for various reasons. It is also possible to have miscarried, which at this stage would be a fairly small clump of tissue. So take a few more tests and follow the instructions about when and how carefully.