Starting dhea today!

So last year I went to the doc because I was feeling blue. She took some blood and said that my dhea levels where kinda low. And to start taken supplement. I was taken it for a little while and then just stopped without going back. I have always had a 28 day cycle when I was younger. And now My cycle has been 26 days which isn't bad. I have been reading alot about it and it said it can cause infertility problems if its low and wonder if that is what the problem is and I should start taken it agian until I get a bfp then I should stop. Wonder if that a good idea and see if it works or keep doing what I am doing. I have also read in decrease miscarriage..