I have a little bump on my cervix and all symptoms of an endometriosis

The thing is, i feel like my world is falling apart, i'm under a lot of stress and i'm a teen scared to death of being pregnant. I missed my period by two days but i'm super irregular, my cycle is between 24 and 43 days, a living hell, cramps are horrible too. 3 weeks ago i had sex completely protected, my partner says that there's nothing to worry, even i saw the used condom perfectly normal, but i'm always scared and i just want my period to start so i can tell my mom i should go to a gynecologist bc i have all the symptoms of endometrosis and i want that checked out. Two weeks ago i had a brown discharge that i usually have at the start and end of my periods, but it was too early to be my period. I have no other symptoms of a pregnancy, i even have my PMS diharrea. Today i inserted a finger on my vagina and touched my cervix, it was smooth and all, but a little part didnt feel as smooth, not rough, just not perfectly smooth like the rest of it, and then i felt a little bump, it didnt felt sensitible or anything strange, just a small bump. I'm not a native speaker so excuse my errors and all that