Don't worry ah! I and you have the same expected day to give birth to baby. Last week, i am 6wk2days, my dr. also can't find my baby's heart. I know your feeling.Today7wks5days, I finally see the heart beat. My cycle is 30days, so if you have 40days, you should expect it will be later to see your baby's heartbeat. My doctor said actually don't examin so early, otherwise it will give pressure to the mother. So relax ah! we will support you!