I am on cd 15 my periods have always been irregular...so its hard for me to tell when i O but i think i did friday had a BAD BAD headache.... and i never get um... well i have been cramping very low in my tummy off and own for the last two days.... i know i am prolly just getting my hopes up but whe would be the best time to take an hpt? is it to soon to tell ? should i wait another week ? thanks for your help Baby Dust to ALL :)