Weight waiver for Navy jets?

I will be going down to Pensacola this August to begin Navy flight school as an SNFO. I am not currently qualified for jets because I do not meet the minimum weight requirement for an ejection seat. However, I was told by a LT that it may be possible to obtain a weight waiver as long as I weigh over 100 pounds (which I do). Does such a waiver exist? Do I need to wait until I get to Pensacola to talk to the medical staff there or is there something I can do now to go ahead and get the ball rolling?

Also, do they take your weight WHILE WEARING all flight equipment to determine whether you’re qualified or not? Or do they use your normal weight?