Thanks for your query.
IF your husband is not willing for second baby, then I wonder how you would conceive !!
That said and done, if both of you actively decide to have a baby, please consult a gynecologist.
Learn about the ovulatory period, and have intercourse during that fertile period.
Take folic acid
If you fail to conceive after a year of regular intercourse, then consult an Infertility
All the best.