Breast tenderness

Hi all. I have a question....these last few days okay actually almost 2 weeks my boobs is so sore and swollend and heavy. I did took a pregnancy test before my period started and it was negative. After that my period starts and it was so light and only for 3 days where i normally have it for 5 to 7 days and quite heavy. My next period isnt for another 2 weeks. But i need advice. Did this ever happend to you? Me and hubby are trying for baby nr 2 for 6 months already