When do you think (DPO wise) it would be best to use the clear blue digital?? I'm at 13 DPO and have severely sore and erect nipples that have white tips, along with fatigue. Used two Tesco pregnancy strips that came back with the faintest lines so unsure. Only have one test left but my period is due in two days so should I wait or would it be okay now? Do not want to be disappointed but any advice?? So worried about my nipples (sorry TMI!) X