I was diagnosed at 6wks with a subchorionic bleed as well, at first early on i had bad cramping and bleeding i even passed a clot a large one. I was conviced i miscarried. Went in for an u/s and baby was great hb 123. told to stay off my feet, i was a nervous wreck as i spotted since with slight cramping. At 8wks another scan, baby was great hb was 147. i am now 11 wks pregnant and still have slight cramping ane backache. It is nerve wrenching but ive learned from this that just because you bleed or cramp does not mean you will miscarry as i thought before. Good luck.
I'm on baby number two as well and I am having way more back pain,more nausea in the first trimester and I have been diagnosed with subchorional hemmorage,which causes u to bleed.none of these symptoms at all with the first.I just try to stay as positive as possible because I don't want the pain to cause stress for my baby.you are not alone though