Hives/rashes very early pregnancy

Faye

Okay so a week ago I had unprotected sex and it’s like I could instantly tell I was pregnant but I’m not sure because I haven’t done any tests yet since it’s really early, but I’ve been very fatigued, nauseous and I’ve broken out in rashes that look like bites all across my hands and arms, does anyone know what this is? I’ve changed my covers, showered 3 times, literally cleaned every inch so I know for sure it’s not bed bugs