Night shift problems or could it be?

So I just started working night shift 3 weeks ago. I'm always super regular And so far I'm 7 days late with a BFN at 5 days late. I'm cramping. Sharp pains in ovary area. Fatigued. Bloated. Constipated. Sore breasts. I'm wondering if my period being late is caused by my change to night shift as I have read it can cause that or if this is actually the month!! Any comments/advice/opinions??