Question!

Sarah • Hi ya`ll the hubby and have two great kids! DS who is 2 yr old and a DD who is 9months!
Hi ya'll this is my first time on this board.  My name is Sarah. The hubby and I have been trying to conceive since June 2013. I got pregnant in September and had a miscarriage of the end of October of 2013. This is the first month of trying again.  My last AF was march 2nd to 6th. I started doing opk on the 5th day like it told me to and I hot a positive on march 12. But glows Calendar says march 22 was the best day to get fertilization ?? So my question is why are they different and what do it do?? Thank you in advance for the help. Sarah