Samantha
You are under the earnings limit for CA and the 24 hour rule for ESA, so the only remaining issue is whether you husband is receiving Income Related ESA either in part or in whole, if he is then your income will be deducted £ for £ and in the case of the former this could remove his entitlement to ESA(IR) and the passported benefits that come with it.
If he is only receiving Contribution Based ESA then it will not be affected by your income or working at all.
Your income may affect your HB.
Put your information in to one of the online benefit calculators to see how you will be affected.
www.gov.uk/benefits-calculators Gordon