Can I Still Get Pregnant When We Used Withdrawal Method And The Morning-after Pill After Both Times, But Now Having Severe Nausea?

My menstrual cycle is about 30 days and my first day of period usually is on 21st. If I had sex on 8th and 16th of which on both occasion both withdrawal and morning after pill were used, would conception still occur? Nausea is on another level, I m worried