Could Stress And Exercise Affect Menstrual Irregularity Post Emergency Pill Usage? Moderate Public For

I had unprotected sex on the 23rd of August I took the emergency after pill on the 25th of August and then five days later I started to bleed for roughly 4 to 5 days like a normal period and I was meant to have my period round about the 19th of September but I am late he didn’t finish in me at all and we are 98% sure that there was no pre-cum . My periods are sometimes irregular, in July my period was from the 25th till the 29th and then August was the 19th until the 25th . Am I overthinking ?? This is the first time ive taken the emergency after pill and ive recently started college and started exercising and stressing about the situation I had sex I was on my period does that effect it in anyways and the face he didn’t finish and that 0-2% pre cum