I was not actively TTC (kind of a "if-it's-meant-to-be" sortofa mindset), so I wasn't wondering if I was preg at the time. But every once in awhile my nipples would just be so sensitive! Like, if I brushed up against them. I was all like, "WHY DO MY NIPPLES HURT????" and my poor DH was like, "I bet you're pregnant!!!" The other parts of my breasts didn't start aching until much, much later.
Wife to dh and mommy to dd1 (3/07), ds (1/10), and dd2 (any day now)!