A. In general there are no medications that will effect the results of your pregnancy test- either positive or negative. The only medictaions really known to cause false results, false positives imparticular, are those medications containing hCG. These drugs are used in conjunction with infertility treatments. In these cases your doctor or fertility center will tell you not to take a pregnancy test until these medications have cleared your system.
Birth control pills and other forms of birth control do not effect the results of a pregnancy test urine or blood.
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7/4/07 
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