my period has never been maybe more then a day late but that was because of i counted the days wrong. But its 4 days late now. 2 of the 4 past days i have had like a drop of blood for both of those days, and that was it. I had cramping before my period like i always do, and my breast were sore for like a few days. They are always sore right before my period. I have still had cramps it seems like everyday. Me and my boyfriend had sex the day after i ovulated forgetting til after we did it that i had, because i dont like have sex the week that im suppose to be ovulating. I know that a change in your life style can affect your period but by how much. Ive lost 10 pounds this month and have been working out a lot more. But im not sure its enough to change my period. I have taken a test already and i think it said negative i was completely sure when i read it. Any advice?