I've been feeling sick, dizzy, headache, slight cramping, my period is a week late, nauseous, feel so tired all the time and yesterday I had a pink colour come out (none in pad but when I wiped several times) and day before a slight brown. I've taken three pregnancy tests all of which are negative, first day of last period was 26/11/2015 an average cycle is 28 days! Going out of my mind! Any advice?