I get two sets of lines a month too. Sometimes they are dark some not should I basal temp I mean I would assume I am ovulating since I get lines right? I don't use digital opks but the blue lines been ttc for four months help!
Never thought about doing BBT vaginally...I just have a hard time remembering to temp and it's hard to understand. I'm still getting positives on the line tests, negative on the digital.
OPK's actually only give you your LH surge and when it's at its highest point.. Your body may have started to the first time but didn't until cd14..which is actually better as it gives more time for the eggs to fully develop and is usually peak time for many woman with regular cycles.
Unfortunately with only OPK you cannot be sure if you actually ovulate. I would suggest start BBT temping too.
You will def be able to tell when you ovulated and then you will get a better idea and also continue to use opk.. Internet cheapie a work pretty good too and much cheaper!! If you decide to start temping.. U can keep record in this app and be sure to do it first thing in the morning before even getting out of bed and it is best to check bbt vaginally as it seems to be more reliable
honestly hunnie I just believe u have to let nature take it's course and when it's meant to happen it really will :)