How far along am i??

All of my apps and trackers are saying that I should be about 5 weeks today, however I went to the hospital last night because I was having some light cramping and I wanted to make sure everything was okay. They did a vaginal ultrasound and told me that I was only 2 weeks. My last menstrual cycle January 28, and my hcg levels were 1170.1 last night. I feel like that would be to high of a level to only be 2 weeks along. I need help and answers! Please!