Stressed about my first IUI...

My husband and I started our fertility testing in October and I am about to have my first IUI. I had an HSG and bloodwork and everything looked normal on my end so I was not given any medication. The reason we are doing the IUI is that my husband is on a medication that can cause birth defects, so we are using donor sperm. I was hopeful and optimistic, but I am reading so many stories of people who have tried so many times and were not successful. It's really bringing me down... Can anyone provide some positivity?!