Natural or not, 8 is below the acceptable range that some Drs like to see (10), but many Drs that treated women here like to see over 20. Yes, a natural bfp should mean that you have a functioning CL cyst, however those of us with hormonal issues sometimes have CLs that don't hang around long enough for the placenta to develop, thus causing a drop in hormone levels and ending an otherwise viable pregnancy (the drop in p4 is what brings on AF each cycle after the CL cyst disintegrates). The nurse is right in that p4 won't save a "doomed" embryo from its fate, but with that logic, there's really no reason to NOT be on p4 since it CAN save a viable pg from ending simply bc of a lack of p4.
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