spotting at 16dpo

grace

so my spotting only lasted four days today is the 4th day… it’s steady spotting not clots no heavy bleeding what could it be? i woke up nauseated with pelvic pain and my nipples are a tad sore period was supposed to start on the 11th but instead i got light spotting been spotting since.. i’ve got a headache tonight any ladies can give me any insight? took a test last night and negative