Irregular period ; unprotected sex

Me boyfriend and I normally have unprotected sex but he always pulls out and my period has always come. This is the first month he did not pull out. This happens about 4 times the most recent within a week of when of the month mark from my last period. I had also had cramps like I was gonna get my period that day but it never came. My period has almost never been on schedule and lately it has been a few days later and later each month. I know the women you are around most often changes it as well as physical activity, however I have gotten discharge that looks like after period discharged. Which is weird since I have yet to have my period. What could this mean?