have a question!

a) my boobs and nipples hurt, what can I use to alleviate the pain? b) I'm only 4 days po. ttc. used preseed, had lots of BD. AND MY boobs hurt SO bad. which doesnt happen until 2 or 3 days before my period. Af due March 20th. I know they say it's impossible because it hasn't even implanted. thoughts?