I recommend you go to the doctor immediately. Unusually sore breasts could in fact be breast cancer
~~~Here Are Some Symptoms
~The whole breast can look red and inflamed and can be very sore.
~The breast may feel hard.
~The skin sometimes looks like orange peel because the pores stand out in the inflamed area.
Now I really highly doubt you have breast cancer. Missing your period has no explanation with that, so I think you are in fact pregnant. Wait one or two more days to test yourself. Comes out negative see a doctor and get a blood test
~~~So here are a few more symptoms to look after for Pregnancy
. These are the early symptoms:
~Delay/Difference in Menstruation
~Darkening of Areolas
Now I am extremely going for Pregnancy so check out all the symptoms just in case and Good Luck! So go to the doctors if your tests keep coming out negative to get a definite answer.