Well now here's the thing (and the reason I'm still in utter shock) - I actually came off cerazette at the end of June, but around my birthday (15th June) I missed about 4 days worth by accident (my birthday, DS's birthday, lots going on and not to mention the fact that I'm a forgetful dullard!).
I had a stupidly heavy period (new pad every 3-4 hours, not like me at all) which started on 16th June - earlier than expected but I put it down to the missed pills - I still never thought anything of it though as I always miss a couple during the month; I don't think I've ever had a month where I've taken every single one.
So, my question is - did I just happen to ovulate straight after I properly stopped taking bc at the end of June (the 2ww after which would take us up to now) or did we have an accident earlier due to the missed pills???????? 
Ultimately it makes no difference - we wanted a baby and it looks like we've got one... I'm just really struggling to get my head around it - I've just turned 36 and just come off cerazette so it was supposed to take months wasn't it? Don't get me wrong I'm really happy - I just think that fear is suddenly playing a bigger part in my emotions than I think it would've done if I'd had a couple of months more to properly prepare for that BFP.
No, we didn't use OPKs or temping. DH and I are both born worriers and he gets particularly stressed when in pressure situations, so we just decided to DTD EOD for the whole of my cycle, then we would never really know when the "right" time was - it worked for us first time round and appears to have done so again. I can definitely see why people would want to know when they were ov, and maybe if we'd got a few months down the line without success I would've changed my mind.
Sorry for the long post and apologies to everyone reading it who thinks I sound selfish or ungrateful - I know every single one of you would probably give anything to be in my shoes right now. I wish every one of you a speedy BFP and will keep checking in on here to see how you're all getting on if that's ok?
Hugs (virtual, not real, obviously cos that's just not done on MN
) and baby dust to everyone.