I was to have my period the first week of march but had unprotected sex before it came . I took a emergency contraceptive about two days after , about a week after I had cramps that felt like the one when am about to see my period . About three to four weeks had past and still no period I am having really bad upset stomach , neausea ,vomiting,headace ,lossof appetite ,weightloss ,cramps and frequent urination . Could this mean am pregnant? I have an appointment with my docter Friday but I want to know before

No/yes, they are signs but normally not till 2nd month, but they are also side effects of the morning after pill, which will also cause you to miss one to two periods after taking at times.