I am 22 never had sore boobs before, but I have now, been sore for 2 weeks now. Pain is in lower half of breasts and nipples. Been on cerezette for 6 months or so and the injection for years before, no periods, so I don't have a clue about my cycle. Last had sex probably 3 weeks ago - unprotected (long term partner). But haven't really got any other complaints, maybe a little bit up and down emotionally. Any ideas?