So confused

Amanda
Ok ladies I need some help... I am 21 dpo and at was due the 25th. Still no sign of her and my blood test two days ago was negative. I had a faint positive before that. I'm having a few symptoms including slight nausea, sore and swollen breasts, very gassy, metallic taste in my mouth, some slight cramping, I'm emotional and moody and irritable as well. Someone please help :/ could I be pregnant even after a negative blood test?