Just my braces off but there's a gap between my front teeth?

1/23/17 I got my braces off. I have had them on for more than 2.6 years. I went to the orthodontist as they finally took it out. But when they did between my front teeth was a gap. I was mad because I had spent over 2 years with them on to get my feet strighten and with no gaps. Everything else is fine except the gap between the front teeth. They orthodontist said they are going to make the retainer tighter so the gap can close. What should I do