10 days late and still BFN!

I'm officially 10 days late with no signs of AF and all I'm getting are negative pregnancy tests! I'm scheduled for a colposcopy on Monday and desperately hoping I get a positive soon so a biopsy doesn't happen and possibly result in a miscarriage. I'm so frustrated as we've been TTC for almost a year now. This is the closest we've ever come to a missed period!