I am sorry you are having to endure this. I hope you get the answers you are looking for soon. If you are unfortunately miscarrying, a home pregnancy test will keep showing positive results until your HSG level is back at 0. The only way to tell if it's viable is to see if your HSG levels are climbing. I wish you the best of luck, and sending hugs your way...
i guess it might be implantation bleeding.. but u should consult a doctor..