Fertility clinic or gynecologist?

Hi ladies,im here asking for your help. Currently 25 days late and all bfn. I feel so frustrated because went with my regular doctor and they wont do blood test. I just want to put my mind at easy because my last menstrual cycle was July 30th and my cycle is never late for this long!! Of course im trying to get pregnant. My husband and i have been trying for 2years and just last march had a miscarriage. Do you ladies recommend going to a gynecologist or fertility clinic to see whats wrong with me. Why i havent got pregnant and my period is late.