Small Gestational Sac

Looking for only positive outcomes/success stories, please.  I need to keep the faith and stay in the right frame of mind.  I started spotting on Wednesday and went for an ultrasound on Thursday, everything looked fine.  I'm 7 weeks.  By Saturday morning, the bleeding got heavier and my doctor advised that I should go to the ER for another Ultrasound.  They found that the gestational sac was measuring small and that we had a 30% chance of miscarry or abnormalities.  Even though the odds are in our favor, I can't help but worry.  The bleeding seems to have slowed and I pray it stops.  Has anyone gone through something like this with a success story to share?  I have a beautiful, healthy 3 year old and had a very easy pregnancy with her.  Hoping/praying that the sac gets bigger and that we will end up with a beautiful baby next July.  Your prayers are greatly appreciated.  Wishing you a healthy, easy pregnancy.