spring admit

I'm a freshman coming in the spring and I recently found out that I'm not allowed to rush unless I have 12 credits. I currently have 9 credits from taking college courses over the summer. I am really upset and I think this is really unfair. I really want to be in SDT and now I won't even get the chance. I know I can rush in the fall but I heard no sororities even recruit then. Do you know if they make an exception for spring admits for rush? What are my other options?