Ari I've always, until last cycle of course, had a negative at 10dpo. I've not really tested to see if the Ovitrelle was out of my system, just tested early to see if I could stop taking pred but by that indication I would say the Ovitrelle is out of your system by then.
Also, the supposed ovulation pain doesn't always mean that the egg is being released at that moment. The pains can start as the follicle is reaching maturity before the egg is released, so there could still be hope! I think I kept going a day or two after I ovulated just in case. digi always suggested not to assume you'd already ovulated and keep going a bit longer just to be sure and that seemed to work for her! Mind you, as I remember, she was particularly diligent 
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Pebbles, it's so hard to second guess what all the twinges and cramps and spotting mean isn't it? It's like bloody torture! I'll keep my fingers crossed for you. Not too long to go for an answer now, hope it's the one you want. I'm definitely feeling your pain on the pred front. It's making me feel absolutely horrific! I feel so out of it a lot of the time. It's just kicked in like this and I'm hoping this is not the shape of things to come until I wean off it as it's going to make work very tricky! Especially having the shakes so badly. Not a good look for a make up artist.
I think I'm feeling sort of pregnant now so trying to keep the mentalling under control. I actually lost count of the ridiculous amount of times I got up for a pee on Friday night. I have sort of twinges around my uterus which I don't think are scary twinges, more just "stuff going on in there" feelings. We'll see. I'll probably find something to mental about tomorrow!