weird rash?

Lacey • Married since 2016❤️•Mommy of 7 👧🏻👧🏼👧🏻👧🏻👧🏼👶🏻👶🏻•
I'm almost 30 weeks and I have had this rash on my neck almost looks like I've been wearing a necklace but I haven't worn one in like a year... what else could cause me to break out like this!? I've been using the same laundry soap and body wash so it can't be that.