My 3 Yr Old Lab Is Pregnant, We Think She Is Pregnant, She Is Lately Trying To Hump Everything, And Taking Blankets And Balling Them Up With Her Paws, Is She Going To Have Her Puppies Soon????

If you spend regular time with your dog, and she is pregnant, and she's coming up on 8-9 weeks, 99 out of 100 times... You'd know.
 
A False pregnancy can mimic many of the signs of a real pregnancy... Even so far as to cause early labor contractions.   But at this point there are some signs that can't be faked... Not the least of which being, you should be able to see and feel the pups moving at this point.  If you watch her while resting or lay next to her for awhile with your hand on the side of her belly... You should be able to see and feel the pups moving around.  Her belly will be stretched taut and very firm... Like she's going to burst. If she'll let you, you can gently press and run the pads your fingers in along the sides of her belly, if she's pregnant you'll be able to feel the individual pups in their sacs.. Kind of like little water balloons... If you press a little harder, you'll start to feel the hard little nubs of knees and elbows...
 
Unless she's normally very obese and only has one maybe two very small pups (unlikely for a lab)... At this point you should fairly easily be able to tell.