Hey sweetie, I just noticed your question and I'd asked you if you were temping as was gonna ask how as well!
I think you have to be mega strict then before O your temp dips then rises (may be wrong) then dips again before AF - if it stays risen then you could be preggo (again, may be miles off!). I bought a BBT but yet to use it.
Might give it a whirl and see how I get on!
Hope you're all good ladies xxxxx