Nipple soreness = baby, maybe?

Trisha • 30 years old. Two miscarriages, one rainbow baby. TTC #2.
Nursing my 2.5 y/o. 3 days until period and I've been experiencing nipple soreness these last few days. I got pregnant back in November (blighted ovum) and my first clue was nipple soreness. Here I am with nipple soreness again and I feel clueless even though I have already been here before. 
How many of you have had nipple soreness as a pregnancy symptom?