I have been getting cramps but no periods for last few days. I have tested negative in all preg tests but still wants tk get confirmed. Which scan is reliable for this? Can usg pelvis determine if you are pregnant after 4 weeks of missing periods or some other scans. I'm really scared and worried. I want to be get 100 percent confirmed my last and first intercourse was on 8th of oct and never before that or after that. I am 24 years and unmarried. Pls suggest how to get confirmed. I had protected sex.