I use to hunt them during the first 30 days only. Never on the second 30 days.
Hunting them will do them some good. Labor is hard work they need to be in shape to make it go as easy as possible. Now if their is a high chance of them getting injured I would note take that chance. But keeping them in shape and not letting them get fat while pregnant will do wonders for when they go into labor and when they start to lactate. It is well worth the calculated risk of taking one hunting during the first half until they start to get big