Yaz, hpt, diuretic effects??

Hi I was just wondering if the diuretic in yaz birth control would cause a false negative hpt and have any effect on hpt's? The reason I am asking is because I am on yaz and I know that there is a diuretic supplement in it--so, alternatively, if anyone has gotten pregnant on yaz...did you get a + hpt, and when? Also, did you still bleed at the end of your pack? Thanks for your help :)