when I first found I was pregnant at 4 weeks the only symptom i had was tingling nipples...like a strange sensation..like if my bra or shirt rubbed on them they were itchy. eventually around 6 weeks they got really sore
I don't beleive it is a tell-tell sign, but I did experience it..Only true way to tell is a possitive HPT or blood test...Pregnancy symptoms are relatively similar to other conditions.
It was one (of the many) symptoms that I experienced in my last pregnancy and this one as well.