I just started the new semester at school and have been working really hard and staying up really late. Today I just started bleeding like my period started. I am late on my period but I figured it was because I was stressed about school. I don't have any other symptoms like cramps or breast tenderness. I had condom protected sex with my boyfriend 6 weeks ago during my last period. Is something wrong? I am not sure why I am not cramping....... Help.