Im sorry for sounding stupid but I used a OPK today for the first time. I stopped taking the pill a few weeks ago and had my first withdrawal bleed 17th January meaning I am on CD16. The OPKs only arrived in todays post so I thought Id give it a go just incase, I have no idea how long my cycle is going to be after being on the pill for so long even though before the pill (8-9 years ago) they were always regular! So theoretically I could have already ovulated this month but Im worried that there was no second line at all on the test and after reading LOTS of other posts on here some people got very faint 2nd lines the whole month through - could that mean Im not ovulating or havent ovulated?! Help, Im new to all this!