HELP!! URGENT HEALTH RELATED PROBLEM?

So I'm a 14 year old girl, 5'7 and I weight about 129 pounds. Lately, my stomach is looking very bloated, I'm having shortness of breath too. And I haven't gotten my period in quite a while. What could this mean?
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THANKS GUYS FOR THE HELP... BUT IM 14. I KNOW IM NOT PREGNANT CAUSE I've NEVER EVEN DONE ANYTHING!
HELP!! URGENT HEALTH RELATED PROBLEM?
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