Wanting a baby but BD has no sex drive and says he wants to wait a month or so

I know this may be an unfair post because we have a charming, sweet three year old son but timing could not have been more perfect financially and our in laws rent next door and can help with child care all the time. My Husband has  a low SD and says he would rather wait a month or so... I track my ovulation, try to make BD fun and spontantious at times... Just don't under