So we just had our first cycle of IUI. DW usually has 29-30 day cycles. All went well with the OPKs (both the clear blue advance and normal) and we got the surge on both at lunchtime test on 13th Feb (CD 14) which seemed right as it had been saying high fertility for 2 days before on the dual test, we rang clinic and booked IUI for 24hrs later as per protocol so the lunchtime on 14th Feb. On 28th Feb (CD 29) we tested and negative. . However what's confusing is still no AF? Is it likely that the OPKs were wrong? Anyone got a BFP at a later stage? I Clinic have said wait until Monday and then retest and contact them if still no AF. Any help or opinions are welcomed.