Is it a bad idea to start a new job at 18 weeks?

Due to financial stress etc., I felt like I needed to get a job just until the baby is due as I dont want to weigh my husband down with more work than he already has. It will start at 6 am, which means I'll need to be awake at least 4am and my shift ends at 4:30 PM. I'm just worried that my body may react badly to a new stress/life event as I have miscarried in the past. Should I be concerned or no?