have you used preseed?

FH and I have been trying for 4 years now, 2 miscarriages. I keep hearing these great things about preseed and really want to try it but he thinks we don't need to since we've conceived before. He's in charge of the money as I'm not working currently so it's not like I can just go get it on my own haha. can you ladies put in a good word for preseed for me so I can convince him! what are your experiences with it? how long were you trying before it worked for you? how many cycles did it take after using it?