Negative blood test but 9weeks late!?

Jodie
Hey. Can anyone help me. 
I'm nearly 9 weeks late on my period. 
I had a miscarriage in November this year and me and my husband was having sex in December. 
My hpt all say negative 
I had a blood text from the gp on Thursday and that was negative?
I'm feeling pregnant!! What's going on can anyone relate to this?? Xxx thanks in advance