IUI without any drugs

Alex
Has anyone done <a href="https://glowing.com/glow-fertility-program">IUI</a> without any stimulating drugs or hormones and been successful? My gyno is suggesting this for me since I am ovulating but my husband sperm forms are at 4% which they say is borderline. Also, they are recommending we do this two days in a row after I get a positive OPK
Just looking for any advice on this. Thanks!