Ate, I really feel your worry, this is such a stressful situation. Please go back to your OB sooner rather than waiting until Dec 8, lalo na may spotting ka na, especially to rule out anything urgent. The thickened lining and positive PT together need proper monitoring, and only your doctor can give you clarity on what's happening and what comes next. I had a friend who went through something similar, and ang best na nagawa niya was to get checked more frequently para may peace of mind, hindi mag-overthink sa bahay. You deserve answers sooner, sis, don't wait. Sending you so much strength.