I'm on CD 14 and supposedly in my fertile week but I haven't gotten a positive OPK yet. I think this is our 6th month TTC and I think I've only gotten a positive one twice. Anyone else use these? Should I get a digital one? I know someone else who said opk's in general didn't work for her. I also just started taking my BBT and it's really low (under 97). I know it can take healthy couples a year to conceive but I'm 38 and hoping nothing is wrong.  We have an appt with my doctor next week. Thanks for any input!