Any tips for TTC baby #3?

Husband and I definitely would like to have a 3rd and to our surprise, we fell pregnant without really trying for month. It was just a random month of just having one time of unprotected sex. We immediately felt pregnant but sadly, we had to terminate the pregnancy because baby has cystic hygroma, no nasal bone and heart defect. We would like to try for a 3rd but definitely not ready emotionally. I've been feeling really empty because I had to go into hospital for D n C and went home empty handed. It also made me wonder if it's because we got pregnant the first try and by surprise if we just had really bad sperm and egg at the time. Our other pregnancies, it took us a few months before we felt pregnant so we had already released a few eggs and hubby released a ton of sperms prior to the pregnancy thus maybe those sperms are newer. Plus, I wasn't taking my prenatal vitamins. Did anyone find any useful things to do prior to trying to conceive? Like should my husband take his vitamins daily or try to release some of his older sperm prior to us trying? I'm so scared I'll end up with a bad embryo again. I am also 38 years old as well so I can't change that. Any tips or prior experience would be appreciated.