Nipple sore

I just wanted to have your opinion on this... I have been having nipple sore lately, and I don’t know what it means..

I have had sex with my boyfriend on my ovulation days few times the first week of February,

could it mean early sign of pregnancy?

could it mean breast increasing size?

My period is next week, I have NEVER had nipple sore a week before my period.. it has always cramps

do you think it’s something else?

Give it a comment please!