Nov. 26 i had unprotected sex and my boyfriend pulled out and i know he didnt ejeculate in me because i seen him to that somewhere else then Nov. 29 i started my period. Dec. 22 I think i started my period again but im on birth control too. So i dont know if it would have been implantation bleeding because it lasted for 5 to 6 days it wasnt like spotting or real light and it wasnt real heavy it was in the middle im just really worried and i dont really know how i can tell the difference please help.