Can you have a miscariage after a missed period and a neg pregnancy test?

Pregnancy possible. Yes you can have a miscarriage and have missed only one period. Pregnancy test are not a 100% effective so they do miss some pregnancies. If you have any concern you should get a blood test done for HCG hormone to see if you were pregnant. If you have any further abdominal pain, discharge or fever with these symptoms you should get evaluated sooner.