Sorry - do not know why it isn't opening for you - I tried it and it did for me - will paste - but Kenziesmom - did sum it up:
Women who had a female fetus had hCG levels significantly higher than women who carried a male fetus.
This finding is consistent with that found by several other researchers. In a study published by Yaron Y et al in Human Reproduction the authors studied 1,325 pregnant women with singleton pregnancies at 10-13 weeks.and compared different hormone levels including the pregnancy hormone hCG human chorionic gonadotropin between women carrying a male and a female fetus
These findings may have implications not only on evaluating risks of Down syndrome (women carrying female fetuses had a higher risk for Down syndrome), but also on timing of a pregnancy test. If women carrying a male fetus have lower hCG levels then it may be possible that their first positive urine pregnancy test could be delayed because of the male gender.
At 10-13 weeks this should have no bearing on your HPTs or :BFN: .. unless your levels are so low at 10-13 weeks they don't register on an HPT. I think at that point you have other things at work than just possibly carrying a boy. ;-)
Other research has shown that what happens in the first 5-10 days past implantation has no bearing on the rise after that. So that research cited alone couldn't explain why some get later than others. That has more to do with implantation times than anything else. Later implantation are more likely to have a slower HCG rise.
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