I'm a 16 year old female who's 100 pounds. For 3 days ive been bloated in the stomach and I get random aches that will come and go in the center of my lower abdomen. A month ago my stomach was acting up and I woukd get random pains that came and go under my right rib, in my back, and thighs sometimes. I was even constipated for 3 days but then everything went away until now with these new symptoms. It doesnt hurt to pee. I started my period 3-4 years ago but its never been regular it seems like it comes every 3 months or so but when it does its not painful and it lasts a normal 7 days. Do you think this is IBS or an ovary problem or an infection of some sort? I'm really worried.