trying to conceive

I had a miscarriage on the 17th of Jan 2016 I have been trying to get pregnant again for over a year but nothing seems to be happening is there anything else I can do or take its so frustrating I get so down over it I feel like there is something wrong with my body even though the doctors say there isn't that it will happen when the time is right but now is the right time for me so why won't it happen? People who don't even try seem to get pregnant by accident quicker why can't this happen for me