Low sperm morphology and Miscarriage

My husband was recently diagnosed with low sperm morphology (1%). We had been trying to get pregnant for about a year when we discovered this, so we took action quickly! We did our first IUI this cycle and, remarkably, we got pregnant! I am currently 5w pregnant, and have heard that low sperm morphology can be linked to miscarriage. I am trying not to stress about it, but am very concerned about miscarriage (like most of us are during the first trimester). My HCG numbers were 291 at 4w and 1800 at 4w3d. My question is, does anyone have success stories of carrying a baby to full term with low sperm morphology? Any and all stories are welcome! Thanks so much!!