Am I thinking to much into not being invited?

When i had first gotten with my husband 10 years ago, i had also started hanging out with his friend group. We are all big nerds. I have asked before if they were ok with me tagging along and they've said there was no tagging along, that i was their friend too. My husband had called me today and said one of them had asked for the group to have a guys night. Which is in no way a problem. I have no issue with my husband going hang out with the guys. The issue i have is that the only difference between a regular hangout and a guys night is me. Im the only girl that hangs out in the group. In a way i get having a guys night but also cant help but to take it kinda personally since im the odd one out.