Honeybee, when I was pg with DD1 (so second pg as well), I had a big bleed at 12 weeks. I was terrified because I wasn't expecting it and I had never had a loss before so I didn't know what to think. Luckily I had the nuchal scan in a few days and the bleeding stopped after a day and I don't think I have ever been so scared in my life. When we went in for the scan, I prepared myself for the worst, that there would be no HB, but there she was, kicking away and absolutely perfect. It turns out that the bleed came from the placenta, but there was still excellent blood flow through the cord and HB was great so my Gyno (he is also an ob and does morph scans etc) was pretty confident that the pg would be fine and provided I took it easy for the next week or so there should be no further problems.

I'm sure that if bubs HB is still strong and the cervix is closed that things will be fine I know it is scary, but just rest as much as you can - not easy when you have a toddler I know, and take care OK.