It's unlikey you'll get a uti. Men very rarely get them and when they get them they KNOW they have one. I've had lots of utis too and by the sounds of things she may have had one but whatever the cause, sex should NOT be painful at all...first time, maybe but the pain that you've both experienced needs to be investigated asap
well theres azo at home tests if she thinks she has a uti. if she has one and its been days, she would notice by now. I suffer from them frequently, basically you need to pee often but when you go to the bathroom, you pee a tiny bit and it burns like fire! D: to the point where one might cry. but if she thinks she does and its been more than a few days its important she goes to the doctor asap because it can spread to the kidneys which is bad! also if she does have a UTI, use protection because it can spread through sex. also, when I had a UTI and my boyfriend and I had sex, it felt nice because it was like itching inside where I needed to itch XD if that helps at all...
it's the same with my gf also. i will be happy if anyone reply to your concern also because it would help to both of us...