Whilst I understand your reluctance to be separated from your husband, I think the position taken by the company is 'normal'. My work has also taken me away from home for weeks at a time but I always paid myself for any weekend trips home. Tread carefully, I presume you knew that you would have to spend time away from home when you accepted the position? However, I appreciate that the timing is not good for you at the moment so I think you should discuss the possibility of a postponement with your supervisor ASAP. Hope it all works out.