Could Delayed Periods Be Due To Stress?

Hi! i take Orsythia (LEVONORGESTREL (0.1 mg) AND ETHINYL ESTRADIOL (0.02 mg) TABLETS as my regular daily birth control. in the past month, i had a prescription for penicillin (starting 2/23) and a z pack (starting 3/17). i am sexually active, but use a condom with my boyfriend every time--just in case. between my pinicillin and the z pack usages, i had sex about 7 times. he did not ejaculate every time, but still used a condom. they have never been broken. i have been under a little stress, and now, i am concerned becasue i was supposed to get my period yesterday. please help!