U can,ask ur doc for a blood test. My gyn office only does blood test because they are more reliable than urine
Some doctors only do urine-based tests, and they aren't much use in the middle of the day after you have drunk a lot of liquids. If you do ask the doctor for a pregnancy test so early, ask for a blood test.
Many at home pregnancy tests can show up positive two days after a missed period. Also your doctor can do blood work to check for pregnancy.