Good Morning, I need help

Ok so my AF is 3 weeks late. I'm on cycle day 57 and my pregnancy test are coming out negative. I want to the doctor because I'm scared now but I don't have a primary healthcare doctor and all the healthcare clinics I went to, gave me a pee pee test and told me I'm not pregnant and send me home and I told them I wasn't even there to find out if I'm pregnant or not and the couldn't tell me who or where I needed to go...(I know I'm not pregnant the pregnancy test at home keep coming up negative.) I just want to know what kind of doctor or hospital can I go to, to see if I have like serious problems going with my pelvic area?