I'm supposed to take it for 5 nights before bedtime. All has been good so far. But I'm supposed to take my 4th dose today and I have started my period. Now, I know not to use or tampon or anything but, my question is "is it ok to go ahead and take the 4th dose while I'm on my period?" I'm afraid to do it without asking my doctors first but, it's Sunday and their office is closed. Please help me answer this question. I want to stay loyal to my doctors orders and take it for the full 5 nights. I'm not so much worried about the medicine coming out or anything But, I don't want to do It and then It causes a health issue or something.