18% morphology doesn't mean you can't achieve a pregnancy. Although above 50% is considered normal, with a good count it is definitely possible - even without medical intervention.
One method that could improve your chances is IUI - where a higher concentration of healthy sperm could be injected directly to your uterus at the optimal time in your cycle.
In your position, if I wanted another child, I would not give up.
All my best,
Rachel Inbar
www.FertilityStories.com
