Much will depend on your goals and your financial needs.
Until you hit your FRA, you CAN work and earn up to $15,720 (in 2016) while still collecting your "reduced" benefit. Once you go over $15720 you will have to pay back $1 for every $2 over. So if you earn less than $15720, no worries. Plus, in the year you retire, there is a much higher limit, say about $41,000, and you only pay back $1 for every $3 over that amount.
That said, you have to consider why you want to collect before age 70. Maybe the size of your benefit is not very critical because you have plenty of other retirement income - so you would rather collect more months of benefits, but at a lesser amount, to make up for the extra payments you'd be getting. Remember that if you will be relying on your SS benefit in your older years, due to less other retirement income, you may wish it to be the biggest it can be - such as not collecting your OWN stil age 70, so it is 32% bigger than had you taken at 66.
If your husband has or will file for his own, yes, once you are at your FRA, you can file a "restricted" application for spousal benefits only, so you can collect some money for all the months til 70, while still leaving yours alone and letting it grow to age 70. But he has to file first, to trigger your right to do so, and you can't do that until you are at FRA.