HB and closed cervix is a great sign. Very scary times, but not necessarily bad news.

It can happen and result in a healthy pregnancy - my sister is living proof of it, mum had a threatened miscarriage with her, and was on bedrest, and she got a nanny for me in that time (who is now a midwife that I communicate with at least weekly) She had placenta praevia with that pregnancy, and that was later deemed to be the cause of the bleeding early on.

Fingers are crossed for you!