Has anyone had a false positive with CB digital? I had a m/c at 9 weeks on 10 Dec 2011. BFN on 4 Jan 2012. Period on 18 Jan 2012. My period is now 6 days late so took a CB digital on Sunday and came back pregnant. Took another one yesterday and said negative (although this was late in the day) and took a first response this morning and negative. I'm so confused - how could it be positive and then negative? Any thoughts appreciated.