hi everyone my period is 3 weeks late and no bleeding, been having back pain headaches and very light spotting on 3-22-17 could i be pregnant. Also i took a blood test and urine test and those were negative. but i remember the doctor told me a week ago on 3-15-17 that if another week goes by try another pregnancy test. so should i take another one tomorrow or wait till the end of the month. thanks