If she just got pregnant she wouldn't be having those symptoms...Specially the larger belly...That for sure wouldn't happen this soon. She might be so freaked out that she's making herself feel t his way. At her next period, only if missed or if it's different than others I would suggest taking a test or two. If those come up negative more than likly she's not, but it's always a good thing to get a drs oppion too. :)

I hate to say this to you but 15 year old bodies are not meant to have sex, much less anal sex. Belive me I know from experience. I just turned 17 and I am 7 months pregnant. When I first started having sex with my long time boyfriend at 13 we never got really into it, he was 14 and still younge so it didnt effect me that much. But after he and I broke I started going out with an older guy, a much older guy. He was 21 and I was 15. Thats when I started to have the same problems as your girlfriend. I not sure if it was because he was larger or that we had sex more often but I can assure you that alot of your girls problems are due to overstimulation. 15 year old bodies are still maturing and when you subject her insides to that kind of force you may have bruised her bladder, causing to fequent urination. Another tip that might help you, but something you should never tell her. Most girls go through a growth spurt at the age of 14 15 and this may cause her to gain some weight. If she were pregnant and starting to show she would be atleast 4 months along, so I dont think thats it. Just try to reasure her that everything is ok and maybe give her a rest for awhile.

I've been experiencing that too before because I was so paranoid. Stressing a lot can cause frequent urination and some pains on the abdomen because of too much acids preduce due to stress. I think she is not pregnant

The only way to know for sure if she is pregnant or not, is to take a hpt test or go to a doctor! Her symptoms are pregnancy symptoms but they as signs of her period coming as well....Just take a test!