So when I went to the hospital last week the nurse said going by my cycle im about 5 weeks. They did a sono and the doctor said I was 6. But it doesnt all add up ? How do you calculate your due date on here? So I could see how many weeks I really am. I last started on july 6 & ended july13. && my pd is regular so iShould of got it on August6th but iDidnt. Can someone help?