tilted uterus and ultrasounds

Hey there! Anyone else have a delayed clear ultrasound pic because of having a difficult tilted uterus? 
Between estimated 6-7 weeks they only saw an empty sac. 😢 They told me not to worry yet but it is hard not to!  
If you have a tilted uterus, when did you have your first clear ultrasound? Also, when did you hear/see the heartbeat?