Going raw šŸ™ƒ

I slept with a guy today and we didnā€™t use a condom. He didnā€™t cum in me but Iā€™m worried because I would be on a ā€œfertile day.ā€ Iā€™ve been using oral contraceptives for years but changed to a different brand about 9 months ago and my period has never been regular since then and Iā€™m always spotting so i donā€™t know how reliable it is. Iā€™m still protected right?