My last period was november 10th i should be 5 wks pregnant but nothing at all on the ultrasound.hcg level was 118 on thr and 436 on sun, am i preg?

Yes, you are: The rise is hcg indicates a normal pregnancy - you want to see the level double every two days. You got pregnant much later than you thought. On ultrasound you are unlikely to see anyting in the uterus below a hcg of 1500. By Thursday, Dec 25 the pregnancy should show on ultrasound.

Yes, pregnant...: Your HCG is going up; you are definitely pregnant! The HCG level is still pretty low. I would suspect that you are less than 5 weeks now and the pregnancy will be visible on ultrasound in a few weeks. Best wishes!