Hi ladies, hope someone can give me some advice on this? I got my first + opk on cd15 last month. Took one this morning and got this...It looked positive to me but I'm only in cd 13 and this is 3 days earlier than glow predicted to be my most fertiled day! Do I believe the test? I think I fid leave it ​a little longer than 5 mins but compared to one I did last night it is way darker. Worried now as my fertile window has now adjusted itself on the app to starting 4 days ago but I only thought it started yesterday! Wasted time :(