Oh red, I don't know what to say or suggest. As others have said, cb digital aren't as sensitive as others, but at 19 dpo it should be fine. Are you absolutely certain when you ov-ed?
What i will say, however, is that you can test and test all you like today, on whatever brands you like- if you have a sticky pregnancy then you have, and if you haven't, you haven't. The testing won't change anything, it'll just cost a lot and maybe even cause more 'am I/ aren't I' anxiety.
I don't want to be a harbinger of doom- you WILL have a baby, you're a day closer to it already. It might be developing in you now, or it might not. Is your dh with you now? Can you get him to take you out for the day? Can you meet up with some friends? Can you work overtime? I Really would try to find a way of getting out of the house.
I hope , hope, hope that the cb digital was wrong- ill be thinking of you with every thing crossed xxxxxxx