I am on day 7 of my missed period. so far all hpt are negative. what do i do? should i contact my doctor for a blood test?

Depends: If you are usually very regular and have not been using any contraception, you could call MD now. However, urine HCG tests are very accurate, so a negative test usually does mean no pregnancy. Normal menstrual cycles can range from 28-40 days, which is almost 6 weeks. I would recommend waiting at least 1 more week - also be sure to do a test with first am urine when HCG is usually at highest level