What Causes Pink Streak In Cervical Mucous Discharge?

Hi my LMP is 5th April 2011, I had pinkish streak in my cervical mucous discharge, so I went for a scan yesterday, the radiologist told us that there was a sac measuring 22 mm, about 6.1 wk, no cardiac activity and no embryo seen, by date I am 8 weeks and more, I am really worried, repeat scan suggested 10 days later.