Pregnancy breasts vs non pregnancy breasts

Jacqueline
So I took a test yesterday and it came back negative but my left breast is killing me mainly my nipple and I'm not sure if its because I am pregnant (could be I tested early) or that its just the effects of the morning after pill. So thoughts? Advice or experience? The last time I had sex was on the first and took the pill after the condom broke. And I tested yesterday