Sore breasts - pill schedule ?

I started have sore breasts day before yesterday. Today they're a little better but still sore. 6 days ago I stopped taking last months birth control pills and started a whole new month to move my period. I started taking the new pack about 9 or 10 days before the end of the old pack. I'm wondering if this change in pill schedule, and the hormones they release can be causing breast coreness. I usually dont get sore breasts during ovulation, so it's gotta be something else. I thought that last month (like 5 weeks ago) i might be pregnant, but I took a pregnancy test and it came out negative 2 times, and since then I've had very little sex and always take my pills carefully. What do you think it is? I have no insurance, should I wait it out and see if it goes away? Is it nessecary to get another pregnancy test?