nawing feeling

I can't get past the feeling that my urine pregnancy test was wrong. The clinic said it was negative but that it was too soon to tell for sure. I had my cycle per usual (10/2-10/6) with spotting before and currently still. I had unprotected sex on 9/25. Weight gain of 4 lbs in a week, nausea everyday, constipation every day (I go days without a bm), and fatigue...but no sore breasts. I never had sore breasts with my other pregnancies though, but I had all the other symptoms...am I stressing out for no good reason? Should I wait another two weeks for another test?