Welcome to icliniq.com.
I have gone through your history and understand your concerns.
Withdrawal bleeding is only a side effect of the I-pill, it happened due to the sudden withdrawal of hormones from your body. So it does not happen with everyone. You may have Menstrual irregularities in your case, which could be due to hormonal imbalance caused by I-pill, that is why it is a little unpredictable when you receive your next period, maybe you will get it on time or delay by 7 to 10 days. As you took I-pill on time (within 24 hours) there is almost no chance of pregnancy in your case.