I bought some opk's from ebay from a seller called Fertility Plan who has excellent ratings and I have no problem with the seller BUT this is month 2 of me using them and I am worried they dont work! I average 28 day cycles but month 1 of using them I had 26 cd's and got one faint positive on day 15 (but I was POAS too late in the evening around 7.30pm so I thought I could have missed more) - the line wasnt as dark as the control line but definitely there. So this month I have been POAS between 2pm & 4pm and am on CD 14 today but up to yesterday nothing. Do you only get one day when you get a line or if I am about to ov today / tomorrow should i get the line for a few days? Worried i might need to buy some more expensive ones but wanted some advice before i go and spend more money!