Hi, I imagine I'll come across as pretty naive as I'm not even a week into TTC but OPKs have got me really paranoid! I'm on CD 13 and been testing since CD 10 and so far I've had (apart from the control line) no line whatsoever and then a very very faint line today...so faint I keep questioning if it's even there! It's thrown me because I was expecting a faint line even when not ovulating and to have no line at all this far into the cycle is a bit worrying :/ I'm breastfeeding at the moment and despite having a regular period for 15 months I'm paranoid I'm not ovulating! Is it fairly common not to have a line/very very faint line and to eventually get positives?! Thanks!