Can I be pregnant?

Had protected sex almost 2 months ago in July (first time) he pulled out also and at the time, I was literally just off my period so I wasn't ovulating I don't think. I got my period in August and it was a normal period that last 7 days like it normally does. I'm currently getting flank pain, frequent urination, nausea the odd time, headaches, lower abdominal pain and it almost feels all though my whole body is throbbing as in my legs, bum cheeks, everywhere, my knees are very sore also and I have the symptoms of dehydration?? I'm always experiencing a popping feeling all over my abdomen and have been passing quite a lot gas and hicupping lots? I know I'm gone completely off topic but I'm extremely worried. Please help.