Suggest Treatment For Infertility

I had my last period in january and thot maybe i was pregnant so i took a test and it was negative, left it another month took another one still negative. so i went to the doctors and i wasnt pregnant bt they said not to worry and that i was to go back in another month and then i got blood tests took and all my blood levels were perfect. i am not stressed as im quite laid back and ive been a size 14 for 5/6 years now so im not worried about my weight. i went back to the doctor in july and there was still nothing she could do or provide for me and im now starting to get worried as ive been tryin for a baby since november last year. it will be almost 7-8months now without a period is there any advice you can give me? thanks