On CD 10 i got a low reading on the CBEFM, then CD 11 i got a Peak. I followed that up with an OPK in the pm to make sure that was accurate because i never got a high reading and it was pretty early in my cycle. I got a negative on the OPK. CD 12 I got another peak and another negative OPK. CD 13 I got a High and a negative OPK. We were only able to BD on CD 11 & 13 (peak days). Today, CD 14 i got a Low reading on the CBEFM and a POSSITIVE OPK! What is going on? Which is the accurate reading? Should I start BD again?