So I had my first ultrasound today, and the Dr could see a gestational sac but no heartbeat or anything like that. My last menstrual period was Nov 25th and I believe I conceived on Dec 13th. Could it still be too early to see anything? He is sending me for another ultrasound on Thursday and my hcg levels today are almost 22,000, 4 days ago they were 17,000. Very nervous cause I've read that many of you guys were able to see a heartbeat at 5-6 weeks. Should I be stressing out?