Lou, I did 5 OPK's at home and all were negative. I started testing last Saturday, but my last OPK had a very feint line so they decided to bring me in to for a BT. But unfortunately, nothing has happened yet and it's probably going to cost me a fortune in extra BT's. Have to say though, I feel better having BT's than using the sticks cause at least I know the results will be accurate.