Period or being stressed out?

Taelor
Is it me or does anybody else feels like this the week before there period... I feel so weak and tired like I have no energy what so ever. I suppose to start my period next week but I have no energy I also feel shaky too as well. I don't know if it is because I am very stressed out right now or if it is because my period is coming? Also I am on the BC pill too. I have also been very moody for the past 2 days now one minute I'm happy then the next I'm crying and all lol