Unprotected sex during fertile Period

Hi beauties! I just wanna ask something here. Just a lil but paranoid. I had my period last October 3 or 4, so just last week, exactly 18th of October my boyfriend and I had sex and he came inside of me. According to Clue, my fertile window is from 14th to 19th and the day of my ovulation is 18th which was the time I had unprotected. Is it possible that I will be missing my period this time and be pregnant? Comments will be greatly appreciated. Thank you loves! Best Regards, Jean