16 days late

Felicity
No sign of AF. I've skipped in the past but been fairly regular the last year or so, nothing more than a week off at most 2 and I'm past that. Anyways,
 been taking pregnancy tests and all bfn. Decided to take an opk and got this. Am I ovulating? Or close? Or could opk be more sensitive and I still be pregnant? I've read it's possible, if you really want to be pregnant, you can mimic symptoms even if you aren't. I've had nausea almost every day this week, actually got sick one time and about 3 weeks ago had very little pink on tissue. Any help would be appreciated! Thanks!!