Okay, So I had sex on June 13th around 11pm (unprotected, but only lasted about 5 mins)--no ejaculation, possibly pre ***. I have a 31 day regular cycle & took Plan B appx. 22 hrs later. I ended up getting my expected cycle on June 29th (3 days early, heavy period). I had my period for last month too (July) on July 29th. It was also heavy and normal. This month, my nipples and breasts are really sore. My breast hurting during ovulation time is normal, but not my nipples. I have taken about 5 pregnancy tests starting from July 13th (a month after sex). They came back negative. Any help?!!