ABDOMINAL CRAMPING & BACKACHE

Hi Mommies....Since 1 week before my menstruation,just had some weird symptoms sharp cramping at my bottom abdomen especially at night I'm having very severe (lack of sleep),back pain very terrible,I had breast tenderness and I feel tired everytime so I took UPT before 2 days menstruation but its negative so today suppose to be my menstruation but I didn't see yet...is it any serious problem,I'm really afraid No any discharge too.. Please somebody help me 🙏