HELP?😐😐

Last week there was a little bump & was tight 😩😩 i thought it was gas or something but Noo hasn't went down , I had unprotected sex 2 months ago , but I had my normal cycles ?🙄 but they weren't as heavy & lasted for 2days.. So I didn't think I was prego??   ^^^ THIS PICTURE IS FROM TODAY !kept getting negative pregnancy test so I quit trying! I haven't been to the doctors yet.. It was on the right of my lower stomach .. So now a week passed & now the little bump went up & it's tight & my stretch marks are coming worse..  My whole right side feels heavy.. I've been so tired lately.. I'm 16.. And I don't wanna tell my parents so ..could there be a baby in my stomach without even knowing it???