i have only ever found clear blue digital to be good right around my missed period - eg 1 day early at best. I thought they were 50mu but couldn't actually tell you for sure. I also don't know whether you can tell how far post ovulation you are by having a positive test as some peoples HCG levels go up a lot faster than others.
Sorry this doesn't answer your questions - I'm sure someone else will have some more definitive answer for you. All the best


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