I Had Intercourse On Monday. The Condom Was Broken. I

I had intercourse on Monday. The condom was broken. I took the plan b. The next day. I was already on antibiotics Sulfamethoxazole- tmp ds for something. I've been sick all week. Dizzy, nauseous, headache, tired etc on Tuesday. Felt better Wed. Yesterday I got a fever and chills. Came back again today. Do you think my body is confused with all this medicine in me? Could I be pregnant? Did the plan B work? I have never taken it before.