Can you get pregnant a day before af due?

andria

Ok so i had sex a day before af.. my period has been irregular since November odly .. i never even got a period in nov! But I got one beginning dec.. i am now late on my period for the month of jan. He came in me the day before af was due. And now im late with no symptoms.. this ever happened to any of you? Like since the irregular period started in nov , maybe My ovulation days are kinda off..

thanks☺️