Many common lubricants contain substances that slow down the unrestricted movement of sperm, impair their longevity as well as attack their DNA.
Not only the components but also the consistency of the products can contribute to this undesirable effect. (Note: lubricant is not a safe nor an effective contraceptive!)
Saliva as a lubricant is also not recommended. The enzymes it contains can denature the proteins in the sperm and lead to sperm loss.
These days there are also special types of lubricants that aid in conception.
Instead of using lubricants, however, you can first try to use breathe ilo to help you with your desire to have children! Simply breathe to conceive with breathe ilo!