Hi
Just wanted to say I hope everything is okay and you get to see a lovely healthy bub at your scan tomorrow.
How far along were you when you saw the HB at the 2nd scan? My ob told me recently that once you get past about 9 weeks and there is still a HB then your chance of miscarrying is about 0.5%. Not sure of the stats prior to that gestation though sorry.
Good luck, let us know how you get on.