spider bite?

Emmylie

i thought this was staph but everyone is saying it looks like a spider bite now. here is a picture from this morning then today around 6p.m. it is very painful to touch, warm to the touch, and my thigh to knee feel sore like after a workout. the bite or whatever this is, is located on my thigh. just wanted some input before i went to the doc. also 12 weeks pregnant.

this morning:

today at 6: