Preseed pros and cons??

Dawn • After 2 MMCs and 2 CPs in 2016, our 🌈👶🏼 is due 10.17.17.
Hi all. I'm debating purchasing Preseed to try in July. I got pregnant easily in January, but ended up with a MMC in March followed by a CP in April. Any cons? Any positive, quick success stories? I'm willing to try anything as I'm almost 37 and still TTC my first. Last month I did ubiquinol and Robitussin plus OPKs and temping. Suggestions welcome!