Well when i had my MC the dr told me urine test are more sensitive then blood test, cause in order to test postive on a blood test your levels have to be at a 30 and a pee on a stick is i think a 23. if that makes any since.
Blood tests are more accurate than urine tests, so this is the way to go to be sure. However, with this said, you may have experienced a late ovulation and therefore are having a later-than-usual period. Illness and medications can delay ovulation. So if the blood test comes back negative, this is most likely the reason. Good luck!
i think blood test is more accurate to know.