Work during pregnancy

Amy
Please give me suggestions or your experiences! This is my first pregnancy. I work a very active retail job that requires being on my feet almost constantly and occasionally moving or lifting heavy items. It's been rather hard on me in that I get exhausted fast and am constantly nauseous and occasionally end up throwing up. I have had previous nanny jobs and have had a few offers recently but the offers are full time or would interfere with my schedule at my retail job. My husband does not earn enough at his job to support us especially not after the baby is born. I don't feel secure enough to quite the job I've had for 5 years but I'm not sure if it's wise to take on part time at my retail job and find a second part time nanny job that would pay more than my retail job and be less strenuous for my pregnancy. Has anyone been through this same dalema and what would you choose???