I got a bfp this afternoon on a hpt!
Yes, an OPK will quite often come out positive if there is HCG in your system. Its not totally reliable for that though, so same as prevatt said, either go pick up an HPT, or see your Dr. for a blood test. Hope everything works out the way you want it too. Good luck.
I have heard that OPK can pick up HCG levels and also be used in place of a pregnancy test. I would go to the dollar store and pick up a pregnancy test and see if it is positive.
Good Luck!!!