So, like any normal person I have sex! My period usually is on time, and when it's late usually it's only by a couple days. This time I am 8 days late on my period. However, on the 1st of December I did have pneumonia and was in the hospital. I read somewhere that can affect your period. I took 2 pregnancy tests and both were negative... I'm just nervous and I bet me stressing out isn't helping the situation. Please ease my worried mind.