So for the last 3 months I have been using glow. I use opk test and do my bbt and have been on par with glow even right down to when my af has been due. This month I was due on the 4th(glow prediction) and I did indeed start that day, now according to glow I should be ovulating on the 17july and my fertile window started on the 13th, every month I've been using opk test and have always got faint lines running up to the day before I ovulate and then the darker line on the day(sadly I have not conceived as yet) but this time my opk test are totally clear and it's got me worried what if I'm not ovulating this month? I even did a pregnancy test as when I had my son 18 years ago I didn't know I was pregnant until 4 months in as I had my period every month until 4 1/2 months buts its a bfn. Is this something I should be worried about or could I still ovulate?