First off, let me say I'm very sorry for your miscarriage.

Now onto the test. I would recommend you stall as long as you can and get a home test. Start using the Dilution method (it is stickyed on the top of the threads) and then use your home test a few days before. If you pass, keep diluting the same way you were leading up to the home test and continue to use the home tests, always use your first urine of the day as it will be the highest in THC metabolites (consequently do NOT use your first urine when you take the real test). If you fail one of these tests, use the substitution method- they are not allowed to frisk you or monitor you on a pre-employment test, so just follow the instructions on the sticky thread here for substitution.

I wish you the best of luck