What kind of legal structure does your small business have? Assuming it's something like an S-corp, I think you'd owe self employment payroll taxes (15.3%) as well as income taxes on profits you didn't put into your solo 401k.
If you'll have enough money from your husband's income to fund the your IRAs before the end of the year, my suggestion would be to keep putting your business profits into the solo 401k. You'll lose up to a year of tax deferred growth by end loading instead of front loading, but you'll be able to use the full IRA contribution limit ($11,000), plus contribute as much as your business profits allow to your solo 401k. The other way around, you'd have $11,000 less in total tax deferred contributions at the end of the year.
401k contributions also reduce your income for the purposes of calculating whether you're eligible to contribute to traditional IRAs, so check to make sure you and your husband aren't close to the phase out. It'd be a real shame to pull $11,000 from your business to max out your IRAs only discover that the extra $11k in joint income was enough for the IRA deduction limits to start phasing out.