Help!!!

Okay so I have a question because it really has been bothering me so this week I have been feeling so weak and tired it makes no since. I am on BC and I do start my period next week but idk why I am feeling like this. I have the energy alittle. & I feel normal I don't feel sick or anything like that but I am so tired and weak. Now idk if it is because the BC or because I am about to start my period next week or I am getting sick. I have been around my mother and the guy I talk too they are very sick with a cold. I need help!