is it pretty hard to screw it up?? i took a test yesterday even though the instructions sugested i wait till day 8 of my cycle... but i had extra test sticks left over and figured it couldnt hurt... todays test says ive reached high fertility?? only 7 days after my periods first day?? on a reg 28 day cycle... is that possible?? .... its hard for me to figure out FMU bc i pee through out the night so generally catch it after my 4 am-730 sleep cycle... could it be off?