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You didn't mention the pregnancy test and also even if it is possitive, you need to see your gynecologist. They can ask for some tests and confirm about pregnancy or any other health conditions
 

Menstrual cycle can be disrupted by the higher levels of prolactin hormone that may lead to irregular periods or even missed periods. Cabergoline is administered to regulate the prolactin hormone secretion. But if you still have not regular periods even though you started taking this medicine, see a doctor again or you can take a second opinion

Using Unwanted 72 after unprotected sex can help prevent pregnancy, but it's not 100% effective. The pills may cause a delay in your period by altering your cycle. Stress about pregnancy can also affect your period. Don't worry, give your body some time to settle. Taking a pregnancy test will give you a clear answer.

It is good you took the eme­rgency pill like Unwanted 72 soon afte­r the unprotected se­x. The pill works great when take­n within 12 hours. Taking it quickly means the chances of ge­tting pregnant are low for you. You do not ne­ed to take another dose­. Keep an eye­ out for any odd signs like feeling sick or te­nder breasts. But know that the e­mergency pill is only for times like­ this, not for regular use as birth control.

From the information given, it is highly unlikely you are pregnant. Though, it is better to see the gynecologist for more in-depth evaluation and advise