It is indeed possible for you to conceive by carefully collecting your husband’s sperm by masturbation into a clean container and then transferring it into the vagina with something like a clean syringe. In several humorous anecdotes, a turkey baster is the traditional tool! Many sperm will die during the process but enough should survive to give you a chance of pregnancy, given time. There is no need to aim for absolute bacterial sterility. You will find that the ejaculate becomes much more fluid and easier to suck into the syringe after about 15 minutes.