Could I Have an Abdominal Aprtic Aneurysm?

Question

I am 13 years old. I know AAAs in teens are extremely rare, but I have Ehlers-Danlos Syndrome, meaning my collagen is very weak. I am 5'8", 140 pounds, and female. I'm not skin and bones, but I'm thin, and muscular in my thighs. However, I have a think layer of pudge over my stomach, so again, I'm not skinny.

   I have a distinct knot a little above my navel, and it's very tender, and has been this way for months. I hurt all over, due to my genetic condition, but I get shooting back pains at times. The knot has a very strong pulse, too. I'm mildly worried, because my grandmother, whom is also affected with EDS, has a small aneurysm. I have discomfort in that area around my stomach, and it's a deep pain, and it's there most of the time. (I have Ehlers-Danlos Syndrome, Hypermobility Type, by the way)

    I've been flip-flopping, wondering if I should tell my doctor. I'm going tomorrow, and I don't want to mention anything irrelevant and sound like an idiot.

    I'm afraid that this, on a very rare chance, could be an AAA. It's not like I'm a healthy teenager, though! I do have a risk factor, and I have a family history of it. Again, I know it is very, very rare for someone my age, but it's been a concern of mine for a while now.