Negative Test

I have been trying to be a mommy for two years and have had 9 miscarriages. I had my last period Nov 23-26 and I still have not had my next period.. I have taken digital tests and blue ink tests and keep getting a big fat negative. I have been throwing up and am having food adversities. What test have you ladies had the best results on? I feel pregnant.. But I can't get anything to confirm :(

Also I have pcos and endometriosis..