Do dogs know?

Question

My dog keeps smelling my boobs every time he comes around me then stay by my side for a long period of time. I have been trying to get pregnant but not sure if I am yet. I have heard that dogs and cats know before we find out. Is the reason my dog keep sniffing my boobs and under me all the time when he has never done this before until two months ago up to now.

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Wow! Thank you for posting this! And thank you girls for the anwers...I didn't have idea! I have a dog an his behavior is normal as usual...I guess I am not pregnant! ?? A good complement to HPTs...looking in my best friend behavior! Awesome! ???

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My bfs dog was all over me and if I was sitting up in bed he would lay behind me like a back support lol. He didn't do that before and he doesn't do that now. But I don't think he started doing that until after I knew I was preggo

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I was very interested in the subject and looking for answers I found this...
In addition to being man's best friend, dogs are known for their ability to sniff out changes in the human body. For example, in a 2011 study published in Gut, an International Journal of Gastroenterology and Hepatology, a Labrador retriever correctly detected colorectal cancer with 95 percent and 98 percent accuracy in two different sets of human samples. The study stated that a specific smell is linked to cancer, and that's what the pup picked up on.
Similarly, when you're pregnant, all the hormones flooding your body are likely to alter your scent somehow. Not much gets by the canine nose, so there's a chance your dog caught wind of a change in you -- maybe even before you did.
"Although it hasn't been scientifically explored, it's within the realm of reason," says Jennie K. Willis, an applied animal behaviorist with Colorado State University's College of Veterinary Medicine.
However, while your dog may have detected a scent change, according to Willis, it's unlikely he comprehends the reason. So you can still expect your furry friend to raise a puzzled eyebrow when your little bundle comes home.
All dogs react differently to a pregnant owner--some become protective, others more fearful and still others remain indifferent. As your waist expands, their reactions may vary. Your new gait may invoke a protective dog to become your constant escort or send a timid dog to his favorite hiding spot. Dogs that were never lap dogs may suddenly have a newfound interest in snuggling.
This atypical behavior could be due to physical changes your dog has sensed within you...when you weren't pregnant, you probably noticed that emotions -- anger, sorrow or elation -- all triggered a reaction in your dog. So if pregnancy has you riding the emotional roller coaster, your dog is probably along for the ride, too.

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That's How I Found Out WITH My 2nd Was MY Ex BOY friends Boxer Would Jump Up Into My Lap AND Stay There AND Would Not Get Down OFF Me, I'd Say Yes But Test Just IN Case If YOU THIS so

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Both my pregnancies my dog layed on my tummy every night as if to keep the baby warm. And I knew I had lost them when she didn't lay on my tummy no more. Was very strange

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My pup was normal with baby 1 that ended in misscarage but really weird with baby 2 that ended up chemical pregnancy.  So depends I think. I no that both times my taste down there changed for my man so maybe the smell does to. Tmi sorry :p