advice

so i’m 14 and i know i’m not pregnant bc since the last time i had sex i’ve had 2 periods (although they were lighter). but lately i’ve been feeling like i have to pee like all the time. and when i sit down it takes a while to come out and it just a little bit. i’m not having any other symptoms. but i just want to know what’s wrong with me since my mom won’t take me to the doctor.