How long should it take a 20 yr old to get pregnant while having unprtotected sex weekly, and how long after stopping depo?

Unknown: Depot can have an 18 month delay in fertility for some women. In general , there is a 15 percent chance of getting pregnant each cycle. After one year, 85 out of 100 couples will have had a pos preg test. In the next 2 years, 10 more couples will get pregnant. So, 95 percent of couples will get pregnant in 3 years. I recommend that couples try for one year. If no pregnancy occurs, then get check.