Hello, i am up to day 29 of my cycle. no periods yet. usually come day 25. all prgncy tests negative. when should i go to the doctor for a blood test?

Pregnancy tests: Urine pregnancy tests are very reliable.The best time to do a pregnancy test is 1 week after your period was due. So it may still be a little early, if still no period after a week, do another test. If the repeat test is negative, pregnancy is unlikely, a blood test is rarely indicated. Woman who may be pregnant should be take Folic Acid 1 mg every day, to help prevent birth defects.