TTC & issues

We are TTC but my SO is 300lbs, 6ft tall, and 37 years old. I am 5'3 and 139 very healthy, and 23. Do you think this will affect his sperm and cause fertility issues? I'm so nervous we are going to have to do <a href="https://glowing.com/glow-fertility-program">IVF</a> or some type of fertility drugs to conceive! I'm worried with his weight issues and age! I also think he has erectile dysfunction sometimes which doesn't help and when he cum's it's never a lot!!  What are your thoughts??