Could it be that i was just a little too fat....?

It could be that it was pierced incorrectly to begin with. It takes a lot to make a piercing reject after it's healed. It may have been the jewelry, which could have started to rub the inside of the piercing the wrong way.
Aftercare is important, too, even long after you get the piercing done. I've had some issues with a couple piercings I have below the neck, but the problems clear up as soon as I start doing sea salt soaks and use the stretcher salve I made. Sometimes if something is rubbing too tight up against them, they get uncomfortable, but that's nothing wearing looser clothing doesn't fix.

It's probably not because you were "too fat." It could have been the piercer, the jewelry, or the clothes you had to wear. My piercings have been just fine wearing a corset over them, but I let them heal for a month or so before I started wearing corsets again.

You just have to baby the piercings and treat them well, which is what a lot of people (myself included from time to time) fail to do.

I treat all of my piercings very well. I've never had an infected or painful one in my life and I've gone through quite a few. I really don't think it was incorrect aftercare. I know all the facts of rejection, but the scar it left behind it really weird and makes me believe that the guy really did pierce it badly. I can pinch the ridge of skin of my navel and there is a lot of it...so why does the actual site of piercing look like it wasn't pierced all the way down to the thickest part of skin? (I think that makes sense...) Was it more the piercer's fault than mine? If so, after I've lost all my excess weight I can have it pierced again and maybe wear a thick bandage over it when I wear my corsets and not tighten them too much? I'm using Bio Oil to get rid of the scar and now that I'm out of school I can wear whatever I like. Dresses are the best and in super sunny South Africa there are tons of them. I was really hoping i'd get your feedback in particular thanks!!

If it scarred pretty badly, it's likely that it was pierced incorrectly. Rejected piercings should not leave huge scars or thick patches of scar tissue. Small scars are normal, but if it was cared for properly, it should have formed a barely noticeable scar.
You shouldn't need to lose any weight to get it repierced, actually. You'll just have to wear clothing that won't rub against it for the first month or two of healing, or wear clothes that will keep the jewelry in place. It might be beneficial, too, to make some of the stretcher salve I have a tutorial for. Any time any one of my piercings feels the least bit annoyed, I wash them with castile soap and coat the jewelry and piercing holes in the salve and they feel better in minutes.
It's also a good idea to make sure that the jewelry is 316L Stainless Steel, which is a better jewelry grade steel than anything labeled "surgical steel". Bodyartforms.com sells excellent steel jewelry and it's higher quality than most sites have to offer.

Thanks!! Now I just have to find a place near me that does body piercings and work up the courage to go get it done again

Find a good place. Ask to see a portfolio of the piercings they've done. If they don't have one, don't get pierced there.

I have had several piercings and my belly ring rejected also. I am overwieght, but I don't have rolls in that area of my abdomen, (I honestly would like my back to be flat instead of my tummy, but I realized that this would probably make me look pregnant) I think it rejected because although I was cleaning it the way I was told too, I don't think it was a good way to be cleaning it. I was told to squeeze the skin in order to get pus out. I don't think that was right. I'm going to try again, when I get a job. I really would like it pierced! I have my tongue pierced, then I found out about spider bite tongue piercings and now I'm sad I got a central piercing! Oh well.

If there is lymph fluid coming out of a piercing, it should be swabbed away and you should soak the piercing in a sea salt solution. Squeezing it to get the fluid to come out is only okay if you've got a completely clean environment to do so, but you should never pinch a piercing very hard, especially not while it's healing.

Another possibility of rejection comes from just general body movement. If you have a job which requires you to bend over and lift a lot that can cause a lot of the rejection. Not to mention if you're carrying things against yourself its probably not the greatest idea to get a piercing there anyway. Try getting it when you have a little hiatus from work.

Any bandage you put on it for stability should be in a sterile, undamaged wrapper and should be changed about every 2 hours, so the piercing can air out and nothing grows too much.

Sea salt solution is okay, making absolutely sure not to use iodized salt! an easier and safer solution is wound-wash saline/multipurpose solution. It comes inside a sterilized bottle, and should remain sterile while inside the bottle as long as you aren't touching the tip. I know the sea salt solution is cheaper, but when it comes to your body the extra expense is worth it.