what am I doing wrong?

My husband and I have been trying to have a baby for a year now with two miscarriages. I am 22 I have never had any health issues neither has my husband. I eat healthy, do yoga three times a week and work out at the gym three times a week. I have had blood work done that all came back normal and I'm scheduled to see if my uterus is abnormally shaped next week. I take baby aspirin (doctor recommended) and prenatal vitamins every day and track ovulation to make sure we're having sex at the right times. I get my progesterone checked to make sure I ovulated. I'm trying not to stress about it too much but I don't understand what I'm doing wrong. Why am I not pregnant yet?