AS your periods are irregular, we can not go by the missed periods for diagnosing pregnancy
The symptoms which you are experiencing may be due to early pregnancy or may be premenstrual.
It is better that you take urine pregnancy test for confirmation of pregnancy.
If the test is positive, consult your doctor and fix an appointment for USG for dating of pregnancy as your periods are irregular.
If the test turns out negative, can wait for some more time for periods, but it is better to get examined and evaluated for the possible causes of irregular and delayed periods.
Hope this information is helpful.
Dr. Mrs. Sumeet Baheti