2 sacs 1 baby

I've just had a scan this morning at 6weeks 1 day. 
I straight away seen 2 sacs on the screen. 1 embryo with a healthy strong heartbeat, the other sac (much smaller) appeared to be empty. 
I do have a tilted uterus though so wondering if this could have made a difference. 
What do people think chances of viable twins are?? 
1st (appeared empty)
2nd baby 😍😍😍😍😍