Me and my boyfriend had protected sex on February 20th I was supposed to start my period on march 1st it is currently march 9th and I still have no had my period. He did cum inside me but he was wearing a condom and when he did we immediately took it out. I took a pregnancy test on the 7th and it came back negative. But I don't know why I haven't started yet. And my breasts are sore and feel a little bigger. Have any ideas?