Preseed or Conceive Plus

So last year I had a miscarriage in January and we have been trying on and off. My period is irrugular so I don't on birth control to try to predict when I'm ovulatiing and when AF arrives. So anyways I'm trying to decided which one works better for you guys and will not up my chances of having another miscarriage preseed or conieve plus???? 
I'm confused on which one I should try I see mixed reviews.