Took the plan b three times, I got sore breasts?

Ok I know it's risky but thAnks to my boyfriend being careless i took the plan b pill three times in a month. I got my period all those times...the third time though...I got it last week and it's longer than 5 days :( my breasts are sore and I'm worried...(my boyfriend and I also had intercourse between my period and used a condom that did not break) I'm scared...any advise? No criticisms please..