Preseed Reviews

We are going on our 6th month of ttc and am looking at trying preseed this next month. My gyno suggested it, but I've read mixed reviews about it. Some say it increases your risk for a chemical pregnancy. I've had a blighted ovum once and a chemical pregnancy the month after I miscarried. Risk is apart of it all I know, but I'd like to avoid another if possible. Any experiences you can share would be appreciated!