Pregnant Doe!! What everyone seems to have missed...!

SPOILER SPOILER!
The kick in the gut to this film is what the director leaves unsaid. The 'pregnent doe' scene is the hint.
The whisper is the scene when Josh brings back pizza to the camp and we are led to believe Dena and Harmon are having sex in the camper.
After the dam, tell-tale heart paranoia infects Josh.
We are not shown Harmon's demeanor and we are only shown Dena when Josh confronts.
The next clue is Josh increduously wondering aloud to Harmon on the phone why she is calling Harmon and not Josh.
Dena is suffering from nerves and develops a rash evident when Josh first confronts her. She seems to be upset when she realizes why he is 'actually' there - wondering if she was going to narc to the authorities. She is obviously offended on more than one level.
Then Dena calls Anne and confides in her - troubling Anne.
Now his paranoia is consuming and he can't see what is obvious:
Dena is pregnant.
She has repeatedly called Harmon because he is the father...
She confides in Anne because she needs a female friend for support...
She is upset with Josh because he is not concerned for her welfare...
She cannot sit in the sauna as one of her clients suggests because of her pregnancy...
Josh, uncaring for the unborn fawn early in the film, destroys more than just one life when he kills Dena.

This was an excellent film, the director constantly edges you with possibilities: the nosy camper, the blown tire, the muddy shoes, the camera at the fertilizer store, always wondering when/how/why were these 'eco-terrorists' going to get caught... when the story is really about unintended consequences... and the final scene is despite three deaths - nothing has changed... people still on their cell-phones.. even he had one but only gave up his when it was too late for redemption.