Am I still Pregnant if.....?

Could I still be pregnant if at 6 weeks the doctor couldnt see a fetal pole, yolk sac or heartbeat. I had 2 scans done in a week. The first one was at 5w4d and 5 days letter when I went back the sac was 6 weeks. Each time the doctor checked my hcg levels that week they were going up but he could never seea a pole, yolk or heartbeat. My uterus is extremley tilted if that makes a difference.