Hi, Marca. I don't have any specific answers for you, but I did find this article about the potential connections between asthma and infertility. Maybe you'll find it informative: https://asthma.net/living/asthma-and-infertility/
I did some digging online and couldn't find anything about Nucala causing issues conceiving. In any case, please know that we are here for you and are happy to help wherever possible. Infertility is so hard. You're not alone. Sending all the baby dust your way! -Melissa, asthma.net team