hi. :)
I'm also having this pain on my right breast. Though I don't have problems with breathing but it hurts especially when I press the side and under it. When walking, it feels really heavy for me. I don't know. I'm a bit uncomfortable already. It started just this morning.
By the way, I'm 4 months delayed. Not pregnant. I always have this irregular pattern of period since it started way back in highschool. I hope somebody can help me. THANKS.