Thanks for your query.Based on the facts that you have posted it appears that you are trying for conception.
You have done semen analysis
of your husband's semen which revealed motility of the sperm to be less than required for fertilization of female egg .
Since you have not posted percentage of active motile grade one sperms it is difficult to comment on results of natural conception.
It is advisable to consult qualified infertility
specialist for proper evaluation and further treatment to have natural pregnancy