Baby shower

When should I do my baby shower, like does it really matter how far along I am? I'd really love to have it in June around our birthdays but I'll only be around 15 weeks. I would love to combine it with my 21st birthday so hopfully people are more inclined to show up. I'm so scared noones going to show up. I want to do it in the summer and when I'm not so big yet and not extremely uncomfortable. I think this is the perfect time. Thoughts on 15 week baby shower? It is really whatever I want it to be right