Pregnant maybe?

I officially missed my period and I'm having creamy cm. I thought I had implantation bleeding at about 3/4DPO. I've never missed a period before and I don't have any other factors that would cause me to do so but I keep getting negative tests. I guess my question is when you go to a doctor they only do urine tests do I just go in demanding a blood test or are their urine tests more sensative?