I am a week late on my period i have done a pregnancy test and it has came back negative, i am only 18 so i carnt be going through the change or anything like that, im not on any medication and im not necerserally stressed, when would it be best to do another pregnancy test as i would like to do another before i go to see my g.p also, i have really bad itchy nipples, feal sick but not vomiting and have that 'fealing'.