I Firmly Believe I Am Around 12 Weeks Pregnant And

I firmly believe I am around 12 weeks pregnant and so does my partner and my family; I have every symptom there is during pregnancy including the uncommon ones no one tells you about apart from other mothers; but my problem is that urine and blood results both came back negative according to my doctor! I'm worried that I'm gunna go through this pregnancy without any medical help! And no this is definitely not a phantom pregnancy