Second set of 21 blood test and results were 13.5 compared to the first set of blood test results which were 5.6, the doctor said 13.5 is positive but wants me to go for a third lot of blood tests this time on day 16 of a 25 day cycle so 7 days prior to period then said if similar results will look at referral to a fertility clinic which said will involve more blood tests and scans, will it involve anything else?.