Well I have been off the pill for about 3 months now and decided to try taking my temp and doing the OPK thing. I got a faint line also, but mine said if it didn't MATCH the surge line, then I wasn't ovulating. It would seem like I am not ovulating at all this month. I did a pregnancy test and it was a BFN
I don't want to discourage you, just don't want your expectations raised this early on. It can take a while for your body to get into a regular cycle again after being on the pill. The last time I came off for any amount of time was when I was trying for my daughter. I had a cycle that went from 31-33days and for the first three months, I had no period at all and thought for sure I must be preggers! I wasn't and the weight I had gained was just bloating etc.
This time around, I have gone straight into a 28 day cycle with some spotting about ten days before...
Personally, I would keep on with the testing and temperature taking and see what occurs. Fingers crossed for you!!