I had an intercourse with my partner in the last week of April. Then I had took a contraceptive pill to avoid pregnancy then I had periods of 4 days with the dark colour of bleeding after 10 days of taking the pill. After that I got my periods again at 23 may which lasted for 2 days Then I also did the urine tests for three times and that too after long intervals. The result was negative every time. Now I'm expecting my periods to come soon but till now I'm not getting my periods. Is this is happening due to hormonal imbalance because of pill or I'm pregnant?