Sore nipples/boobs

For the past couple days I've had sore boobs & now more recently sore nipples. I've been on bc for 3 years now. I have purposely skipped my period for the past 2 months as I had important events. Leading up to when I'm supposed to get my period my boobs were very sore, but once I started my new pack it went away in a couple days. I'm on my 2nd week of my new pack after skipping my period & my boobs & nipples are sore again ? My bf & I have sex quite a lot, but ironically for the past 2 months hes been using a condom so he could finish in me. Last night was he first time he did not use one & pulled out instead. I don't think I could be pregnant because it doesn't add up...but I'm not sure.