Missing too much work due to morning sickness

Rachel
Hi ladies I need your help. I just got hired at UPS a month ago and I'm almost 4 months pregnant, but since I've started working there I've started getting severe morning sickness. And I lose to much sleep (2:00 am-8:00 am) I don't work much hours. I'm afraid I might get fired because of missing work and having to leave early due to severe morning sickness (I've missed 3 days already and had to leave early twice) if any of you ladies have any advice I'd really appreciate it.