me and my boyfriend had sex on july 21 and we used a condom but after he had ejaculated in the condom we noticed that it had came off and was still inside of me.and i don't know if it was my imagination or what but i felt some semen leak out on me. i keep track of my periods very well and i'm supposed to start my period today but still no sign of it. i have no symptoms of starting my period which is very unusual for me. since about a week after the 21 i felt a little more tired and i have a vaginal discharge that is milky white in color and odorless. i'm not sure if this is a sign of early pregnancy or not? please help i'm really worried.