Please help

Timesha

I been having dual back pain n cramping on and off. Like I cramp for only a few seconds then gone. Slight headache took a pregnancy test this morning it was negative. AF is suppose to come tomorrow about 245 I went to the bathroom n when I wipe it was very light pink on the tissue still cramps come n go dual pain there. My stomach feel uncomfortable and some pain in my pelvic area!! Can anybody help me out please