I'd say forget worrying about things you can not control and go ahead and have those children you've been dreaming of.
Since the beginning of time there have been economy woes, food crisises, and war, but life goes on. It's inevitable for all of us, whether we choose to have more children or not, jobs may come and go, as may financial hardships. In response to some of the comments posted earlier, I feel it's a terrible shame that in society we've come to feel children are a financial burden. The question we should be asking is what will life be like without them?
Historically, many cultures believed that children and lots of them were a sign of prosperity and of wealth because many children meant hands to help on the farm, male heirs to carry the family name, and daughters to marry in with other families to further their prosperity. Those cultures who put limits on children because they were viewed as burdens to society and competition for food and wealth have historically collapsed and suffered.
Consider the current situation in China, where families are limited to "one child" and no more, for the good of society. There the government put restrictions on families to ensure wealth and food for the entire nation. No one there anticipated the horrible earthquake that has taken so many lives. The big story in the news is that many parents are in terrible shock and mental distress because a large number of the victims were children killed while at school. The video of wailing mothers and fathers is heartbreaking. Many of these families can not physically have any more children because of the laws imposed there.
If truth be told, most of us can live without cars, big houses, spendy vacations, or personal hobbies and sports. Afterall, how often do these "things" really bring us true joy and satisfaction? Some people feel their careers are satisfying, but how satisfying is it when you get a pay cut, dissed by your boss, or have to work long hours and days away from home? How satisfying is it to have a big mortgage and lots of lawnwork and upkeep? None of these "things" can say "I love you". You can't cuddle with these "things". You can not nurture and watch these "things" become wonderful individuals that can change the future world for the better. With the birth of each child, there also is the birth of hope. No, no matter how many people want to keep putting a price and material value on children and the joy of motherhood, the bottom line is you can't. Children are priceless, and those blessed enough to have them are the truly rich.
Don't underestimate the resourcefulness of you and your husband. No matter what happens to the economy, a family grounded in love will find a way to survive and thrive. The best love stories of children and parents are the ones where the obstacles of life (financial hardships, death, illness, etc) were overcome through the power of trust and love. With love anything is possible.
As always plan wisely, frugually, and to the best of your resources and ability, but leave the rest to faith and live your life in hope. With hope, everything will and does fall into place.