Subchorionic Hematoma ?

I miscarried around 6 weeks with my first pregnancy. I am 6 weeks and 3 days today and found out yesterday there is a Subchorionic hematoma that is causing a complication. I was at work when I started bleeding (not even soaking through a panty liner) so I went to the hospital and they took blood, did an exam, and an ultrasound. Hgc levels were perfectly normal, exam was fine, but the ultrasound showed us the blood clot BUT there was a heart beat. Doctor wants me on bed rest and told me it is a threatened miscarriage, and there is a 50 percent chance I will miscarriage again. I've been trying to stay positive but my mom thinks it's abnormal to have a miscarriage and then a threatened miscarriage in a row and told me not to get my hopes up. I was just wondering if this has ever happened to anyone and would like some positive feedback