Anyone experienced only one boob/nipple hurting? Sign of pregnancy?

Chelsea

Anyone experienced only one boob/nipple hurting? Sign of pregnancy? 

I have been experiencing right nipple pain. My left one hurts just a little bit but not too noticeable. One app says a should have started AF yesterday and <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> days I should start AF on the 30. Took a test this morning and negative. 

Vote below to see results!