HI, I presume that you were investigated & have normal reproductive system. If it's not so, please get it done. No sperms in semane indicate lac of production or Obstruction in passage of sperms. Your husband has to undergo certain investigations to diagnose exact condition.if there is problem in passage ,it can be treated . if his testicular biopsy
confirms +ve sperm production,you can be pregnant by your own husband's sperms by artificial insemination
Even if there is no sperm production, you can go for artificial insemination OR IVF by accepting donor's sperms from sperm banks.
Please don't worry, modern medical science has progressed to such an extent that no couple will be left sterrile unless both the partners are at fault! Please consult an expert&go ahed.Wish you all the best!