Will IBS affect my chances of getting the BBL?

I hope this doesn't sound dumb! I have some body fat and already consulted with a doctor via pictures and he said I have enough for the procedures. I was just diagnosed with IBS... been having the symptoms since last year though when I started cutting calories. When I have flare ups I look fat and body fat increases due to water retention... then there are times where I look thin with little body fat. I'm afraid of not knowing if this is real fat or water retention before the procedure!