Ehhh my period likes to creep up on me

I’ve been waiting for my period to come and I thought it was I had a pad on but nothing and I didn’t and few days later I felt ehh and I woke up this morning and GUESS WHOS ON THEIR PERIOD I was wondering why was so sluggish and crying last night and my Energy is low idk why usually I don’t feel lack of energy on my period but this time around I do and like I just feel so sluggish and really tired