Why is hcg undectable if pregnant?

HCG : Should be detectable very early in pregnancy. If the HCG test is poor quality, then maybe it isnt detecting the hcg.

HCG always: Is positive and elevated if a woman is pregnant. I am not aware of any situation in which a woman is pregnant and HCG is not elevated.

Check blood hcg: A urine HCG test may read negative if the bug levels are low and the urine is dilute. The blood bhcg levels should be detectable several days before you even miss your period. Urine pregnancy tests are more sensitive if you check urine first thing in the morning when your urine is more concentrated.