My period starts from 21st of every month and continues till 26th or 27th. This is a regular process and I never got any problem related to my periods till the time I started using birth control pills. This month I noticed that my periods got delayed and it is 26th but still my blood flow is not on. Does this indicate that I am pregnant? But I know it can’t be possible as I regularly take the birth control pill and also my partner uses a condom every time he has sex. Suggest?