I experience some spotting coming up to 4 weeks ago now. My period is due on Saturday and im waiting expectantly to hope it doesnt show. In the last 4 weeks i have experienced a bloated stomach, darkening of my nipples, cramp and fluttering feelings, metallic taste in my mouth, spotting, slight feelings of nausea. Im pretty sure im pregnant however i did a test on monday (yesterday) and it was negative. Whens the best time to one as my period is due on Saturday?