We got pregnant on our 1st try following 3 months of no ejaculations. is there an increased rate of birth defects from oxidative stress on the sperm?

Congrats: Oxidative stress effects studies on sperms and male fertility are still conflicting, mainly the studies were on assisted fertilization (test tube babies). Natural conception means that only the strong healthy sperm, which can survive and compete, reach and penetrate the ovum (egg) and form a zygote which develops into a baby. So relax, wish you a healthy pregnancy and a healthy baby