Probably a bit random - and I'm fairly certain I know the answer - but just looking for some personal experience on this really to confirm.
I have PCOS and started using the OvuSense about a week ago, following an abnormally long period (16 days long -aargh!).
This morning, after synching the data, the app tells me I'm in my ovulation window and ovulation is today. This is after just 6 readings.
So, I did a OPK and it was negative. Which is to form as I've never had a positive OPK. Ever.
To be fair, this would all be a moot point if I had a partner, as obviously we would just be testing out the results naturally. 
However, I'm using a donor and obviously don't want to alert him for no reason, if that makes sense.
So I guess I'm just confirming that the OvuSense is estimating and I shouldn't rely on it at the moment? But I know OPKs aren't always reliable either...any confirmation that it's just an estimate at the moment?
Thanks in advance. 