If i took a plan b pill before would that have delayed my ovulation date? if so by how long? i took it fertile days leading up too ovulation

Wouldn't delay ovul: Plan B will not delay your ovulation. Plan B functions by preventing fertilization by altering tubal transport of sperm or egg. It may alter the endometrium (lining of the uterus) to prevent implantation which is needed for cell growth. Ovulation is the release of your eggs from the ovaries and Plan B does nothing here. So it would not delay your ovulation.