Allergic to Baby Detergent?

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Since i was about 35 weeks pregnant i have come into some severe itching on my stomach which i thought was due to my strech marks and rapid growth due to polyhydraminos (extra amniotic fluid).

Fast forward 2 weeks later, had my baby at 36 weeks & 1 day and baby is almost a week old and my rash has gone from stretch marks to a full blown red stomach with hives on my upper abdomen, arms, upper and inner thighs, and even some of my butt.

I got to thinking and realized the itching started during doing the babies laundry before birth while having my stomach out & now that baby is here its just getting worse by the day.

Has anyone else experienced having an allergy to laundry detergent or dreft?