hello I think I may be pregnant but am not sure. I missed my period almost a month ago, my breasts are larger and very tender, I have been cramping and feeling nauseous. I used a cheap home test mid day that I think said positive. But I m concerned that my expired implanon or antihistamines for my cilia or bi polar meds may give a false result. But if they die then if a blood test is looking for the same thing won t a doctor also give a false result.