Trying to conceive. Please suggest.

My last period was on 9th Sept(Cd1)and my last 2 cycle lengths was approx 38 days.Took Letroz 2.5 mg from Cd3-Cd7 on advice of a friend who is a gynae and started testing on LH Ovulation kit from Day 10 or 11..Till date the ovulation kit has shown negative result only,however in last cycle there was positive opk on CD22 ,so considering the same time i have kept planned relationships in this cycle also.But not sure why the opk is negative this time.Got my blood tests also done on CD2 of this cycle and my AMH is 6.81..rest all parameters were normal LH,FSH,Prolactin etc. Today i am having pain in my lower abdomen also and yesterday i checked my cervical mucous it was in egg white consistency but today morning the opk was again negative. Please suggest.