Ok, I really need help from the wise women & charting experts on BB. This is my 2nd month off the pill, so i'm new to the charting thing.
BUT....
I think FF got my O day wrong.
It says I O'd on cd 15, when I think I o'd on cd 17. I just want to know if you think FF is right or me . I really like to know how many days my lp is this month, as it was a tad short last month.

Here's my chart
My Ovulation Chart
Now, before cd 15 all opks were - , ON cd 15 I had a - at 10am and 3pm, but then I got a strong + at 10pm (ummm.... I'm a poas addict ). I had + opks on cd 16, 17 and in the morning of 18, then it faded. The strongest + was on cd 16 (this is where I think my lh peaked). So how can I have o'd before all my + opks? Keeping in mind on cd 15 I didn't get a + until late night?

I had fertile cm on cd 15, 16, 17.

I had a small temp spike after day 15, but a HUGE spike after day 17. If you look at last month's chart, I had a small spike before o last time...

So, I believe I o'd on cd 17, but what do you think?