Hi, I Am 2 Weeks Late For My Period For

Hi, I am 2 weeks late for my period for the second time after coming off BC. After taking a blood test and it was negative I went to gyno who gave me norethisterone. She said I should take another blood test just to make sure and then start on norethisterone for 10 days, until I get my period. There have been no Dr appointments available for a week and my gyno is now on vacation. Can I just take a pee test and if it's negative start the norethesterone or is it dangerous on the 1% that the pee test is wrong?