False Positive Pregnancy Test Results This means that the blood pregnancy test gives you a negative result, but in fact you are pregnant. Your doctor will help you figure out your results or perform follow-up testing if … 7 Reasons Your Pregnancy Test Gave A False-Positive The main factors in this case are-. Anticonvulsants. As a general rule, blood tests for pregnancy are more reliable than urine or home pregnancy tests. Such documents include fake positive pregnancy test reports, fake check-up documents, and the like. Is it possible to fake a pregnancy in a Blood test? If so how? The blood test is very highly specific and cannot be faked, whereas the urine test for the same compound may … You could have a false-positive result if you have blood or protein in your pee. lishyoung. Blood Test for Pregnancy: Types, Results, Risks & Accuracy