please answer am I pregnant?

Okay so my period is a week late and I'm having lots of symptoms (nausea/vomiting, lower back pain, headaches, unusual spotting, exsausted, crying, and my skin is super clear and normally I'm broken out a lot ) but pregnancy tests have been negitive except for one possible light positive/evap line. I never have PMS and I'm usually not late. I never think I'm pregnant like this I'm really concerned especially with the spotting it's either pink or dark brown. Also the spotting is inconsistent. Please answer I'm desperate for opinions.