What Causes Delayed Period And Pink Vaginal Spotting While HPT Is Negative?

im 17 days late, my breast and nipples are extreamly sore, i get headaches on and off, dizziness, mild cramps, milky white discharge lotion like, lower back aches. but i tested 4 days ago and it came out negative. my cycle is 39 days i spotted for 2 half days 8 days before i was suppose to start im so confused. could that have been my period but it was so light pink and my average flow is 7 days