Help!!

salma

I and my husband are TTC for baby #3 and i have not been getting a smiley ( so frustrating!!!) but then i do get my period on time which is a 31 day cycle ( also i have been doing opk's, the digital ones, for the past 3 months and no smileys). Hows this possible?? I didnt have this problem for my pervious 2 kids. Can anybody explain?