I'm now on cd 24 and no positive opk. I drink tons of water (I have to, nothing medically wrong) so I use fmu. Cd 16 there was a line a tad lighter than the control line but four hours later nothing. Before I lost weight and had my daughter I used to have strong positives two days in a row. On average based on the past 11 months I ovulate on day 18 only twice have I ovulated on cd 25 and cd 29. I have lost a healthy seven stone and my cycles are shorter would this affect my lh surge? Was cd 16 my positive? If i was my period would be due 24th Feb, periods before started 246 Jan and 24th Dec so it would make sense.