So in my long day of searching the internet today, (which i will likely be doing for the remainder of my 2WW) I found that you can use OPK to detect HCG in the urine before a HPT would be able to detect it. The info says that the OPK detects LH (as we know) which is very similar to HCG, and thus can pick up the HCG as well. And since the OPK are designed to pick up such low levels of LH, (hence the reason you can have a faint test line leading up to your positive just before ovulation) they say that an OPK can pick up HCG levels as little as 10-15 or so. Had anyone heard this or tried this??