I just switched from Yasmin which I had been taking for over a year to ortho tri cyclin.... I shouldn't get my period for 2 wks and I am bleeding heavy and dark... I feel sick to my stomach and there seems to be more pain then there usually is; Is this normal after switching pills? When I switched I didn't take my week off to get my period I just went straight into the new pack of ortho because that is what I was told to do....