help

im 16 years old. and i just now joined this site to get answers. like i said im 16. about almost 2 months ago i had sex with a 21 year old. since then i havent gotten my period untill yesterday. before i got my period i thought i was pregannt. i had all the signs. moodiness. inscrease/decrease appettite (in my xcase decrease), nasuea, getting sick, everything besides swollen brests. i checked online and this one site said you could still get your period while being pregnant. so i think im pregnant. i havent been able to get a pregnancy test. but i dont think i need to. i think i am pregnant. im pretty much like a stick. really skinny but still a great body, b can feel and see that my stomach is getting bigger but i havent been eating. so if anyone thinks i really am pregnant. help me. idk what to do.