Please help!!

OK so i was 4weeks late i took a pregnancy test got a positive let 2weeks go by went to a doctor for a pregnancy test got a positive talked to the doctor and if i am pregnant I'm about 8weeks i didn't get an ultrasound since they only do free pregnancy test and for about now I'm bleeding and cramping should i go to the hospital or is it just a chemical pregnancy? I'm 17 only me and my boyfriend know I'm to scared to tell my mom because i still have a little doubt i know the test say I'm pregnant