Ok, so I have a question about OPK usage. What are the chances that you get all negative OPK's but still ovulate? The reason I am asking is because all of my OPK's have been negative but I'm not so sure they're right. Granted, it's still early for me, I generally don't O until later in my cycle, but things are just odd. When I first started the OPK's, there was no line, and then I started to see a light line, and it did get a bit darker, but never near the darkness of the control line. Today though, there was the faintest of faint lines, lighter than they were before I started seeing double lines.

So, I'm wondering if maybe I did O and I missed it, or maybe I just haven't O'd yet at all which is probably most likely. How sensitive are these things?
I'm feeling very nauseous this afternoon, and I don't know why....is that a sign of ovulation?