mystery hives on legs

I’m 10 weeks, and for the past week or so, I’ve started getting hives on the lower half of my legs in the mornings. The massive outbreak happens in the shower, but its before I use any soaps/shampoo. However, this morning, I woke up in the middle of the night clawing at my legs because they were on fire. I already use free and clear laundry detergent.

I had bizarre sinus infections/immune responses with my last pregnancy, but this is new. I’m at a complete loss on what this is and how to prevent it. Does anyone have any insight?