10 days late...BFN

Hello, I am not sure where I should be putting this but since I'm in my 20s I thought this group could be appropriate. I am 10 days late. No spotting, some cramping, very nauseous in the morning but can't actually vomit, lots of white dishcharge (sorry tmi), and a constant back ache. I am so tired I can't even function. All that said I am still getting a negative pregnancy test. Is this normal? If I am pregnant does this mean there is something wrong with the baby? I am not sure what to do. My husband and I were not ttc but we also weren't not ttc if that makes sense. I just want to know one way or another so I can make sure my baby is getting the proper care and nutrient it needs.