bleeding in pregnancy

So I had a miscarriage and fell pregnant a week and half afterwards now I'm having bleeding it's okay when I'm sat down but when I stand up I leak, I went to hospital with my old miscarriage but they didn't seem bothered and just told me to go home, I don't know if it's normal or if anyone has had normal bleeding through there pregnancy but if I've miscarried me and my partner are going to start trying straight away again, has anyone had a successful pregnancy after 2 misscarries if I've lost this baby? I just don't want to loose a baby again but me and my partner have been ready for a while.