a period of 2 months after vaccination without any bleeding; menstrual cycle was disturbed / abnormal menstruation / menstrual cycle has been all messed up; pregnancy on oral contraceptive; this is a spontaneous report received from a contactable reporter(s) (consumer or other non hcp) from the regulatory agency-web. the reporter is the patient. regulatory number: nl-lrb-00734593. a 19-year-old female patient received bnt162b2 (comirnaty), administration date 25feb2021 (lot number: ep9598) as dose 2, single for covid-19 immunisation; and contraceptive (as reported) taken from an unspecified date. relevant medical history included: "disease risk factor" (unspecified if ongoing). the patient's concomitant medications were not reported. vaccination history included: comirnaty (dose 1, 0.3 ml single, unknown lot), administration date: 04feb2021, for covid-19 immunization. the following information was reported: pregnancy on oral contraceptive (medically significant) with onset 26feb2021, outcome "not recovered", described as "pregnancy on oral contraceptive"; amenorrhoea (non-serious), outcome "unknown", described as "a period of 2 months after vaccination without any bleeding "; menstrual disorder (non-serious), outcome "unknown", described as "menstrual cycle was disturbed / abnormal menstruation / menstrual cycle has been all messed up". additional information: additional information: unknown what the outcome of the pregnancy is. the patient also reported that her menstrual cycle was disturbed, however, it was unknown whether she already had a menstruation after the pregnancy. patient suspect that it is related to the vaccine, but she got pregnant while on the birth control pill. patient stated that she knows the birth control pill is not 100% reliable but she has always taken it faithfully. for quite a few years and never had any problems or forgotten. all of a sudden, she stopped getting her period when she was supposed to and 2 months later, she was pregnant. her menstrual cycle has been all messed up and she suspect that it was because of the vaccine. no follow-up attempts are possible. no further information is expected