sore breast

So my period was originally supposed to start a week from today (before it changing after logging random negative ovulation test) and I tested this morning just because I have a feeling and it was negative. But my nipples have been a little sore today and this actually started happening last night. How sore do they get at the beginning of pregnancy? I'm trying not to keep hoping for it so much and then make myself believe all these things but it's so hard becauSe we are really wanting this right now.