Conception date

Rachel • Mom to beautiful Leigha Marie 👧🏼, little miss Lacey Mae 👶🏻, step mom to handsome Seth Isaac 🧑🏼, and a commercial fisherman’s wife 🐳 ♥️♥️

So my periods were every other month.. I had one in October, missed it in November, and had one in December but never had one in January so I made a dr appointment to get checked out for pcos. There at the ultrasound office the tech found a sac and told me to go home and test, it was positive. I’m due October 2nd but I don’t know what month I conceived. Could someone with the same due date help me figure out when I conceived?