What do you think are the top three things that helped you get pregnant?

My fiancé and I are trying to get pregnant, but I feel like nothing is working. I heard that laying down with a pillow under your butt and with your feet up on the wall after sex helps. I heard taking vitamins helps, having sex every other say, controlling stress levels... It seems like nothing is working. Whether it was preseed, pregnancy vitamins, or anything else, what do you think were the top few things that helped getting pregnant? I'm really hoping for our little bundle of joy soon. 💚