Spider bit?? What should i do?

Brittany • 25, married, one child and pregnant with my second
I "think" it's a spider bite I'm not 100% it appeared couple days ago and it's soooooo itchy.. When I look at it I think I see two marks like a spider bite but I'm not sure.. It's on my belly and I'm 30 weeks pregnant.. So far since I don't know what it is I'm just keeping an eye on it and trying my best not to itch. Does anyone have an idea?