Can Clonazepam cause a false pregnancy test to be positive? I've taken it before and during with all three of my pregnancys with the doctors watching my pregnancys carefully. But every time I took a test when I thought I was pregnant, while taking Clonazepam, it said positive each time and I was pregnant after going to the doctor confirming the positive tests. I just recently heard that it can cause a false positive. But if so how does that have anything to do with the HCG and each pregnancy I was taking it before I got pregnant and never got a false positive. Any thoughts??