Anak, I'm really glad you went back to your OB agad, that was the right call. Pero given na may heavy bleeding, abdominal pain, at back pain, at threatened abortion na ang findings ng doctor, please see that second OB tomorrow talaga, okay? This needs proper medical monitoring because things can change quickly.
I know ang scary ng ganito, especially with all the cramping at bleeding kahit positive pa rin sa blood test. A few of us moms have been through threatened abortion situations, at honestly, ang best peace of mind talaga ay having your OB track you closely, maybe both doctors can compare notes din. The closed cervix is a good sign based sa what your doctor said, pero you really need professional eyes on this, hindi lang online reassurance.
Rest as much as you can, and don't hesitate to go to emergency kung may sudden heavy bleeding or severe pain. Sending you strength, mommy, you're doing everything right by seeking care.