Extremely heavy period, sore/tender breast afterward?

It's been over 2 weeks since my period and my breast have been tender ever since. I have had period prior to that and haven't had sex since April. I don't know if I am pregnant since my period was heavier than normal. So heavy that I was changing my tampon every hour. Has anyone experienced this? I really don't have time to see a doctor and debating on whether I should take a home pregnancy test since my periods have been coming on. Its just I am concerned about my tender breast after having my period. Usually they're tender before my period is about to come on.