Itchy bumps..?

I’m 27 weeks pregnant and i have itchy bumps on top of my vagina, butt, inner thighs & under my buttchecks.. I obviously already had my STD check during my visit and it came back clear. These are tiny bumps that are all spread. My boyfriend doesn’t have it but I’m starting to wonder if he cheated and that’s why i have it..? Idk I’m just thinking the worst right now.. i also read it’s a pregnancy symptom but I’ve never heard of it in my life. Anyone have experience with this during pregnancy? They don’t hurt just itch.. I’ll be asking my doctor when i see her next week!