Yes: Yes, you can miscarry at the time of your period. This is actually a very common occurrence. Pregnancy tests measure HCG not progesterone. Serum HCG level tests are more sensitive than urine HCG pregnancy tests. Progesterone levels are not used to determine whether you are pregnant or not. Progesterone is important, but just not used in this way.
Answered 6/30/2014
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