To answer ur query regarding when the ovulation occurs and what is the best time to conceive in a pregnancy ,you need to be counselled for it plus advised certain preconceptional tests to be done Usually it follows an examination too There are days which are suitable for conception and it Needs to be calculated according to your cycle length and regularity,also there is ultrasound evaluation which shows which side ovulation occurs and when it occurs also there are home based urine test lh kits available which usage needs to he explained and what needs to he done and when it needs to be done