Aiyoh mummy, any bleeding or bloody mucus tu memang boleh buat kita worry, especially when pregnant! Even though your doc said all's okay at the scan, please go see your doctor again or call the clinic, jangan tunggu, just to be safe and get your mind at ease, okay? Better safe than sorry when it comes to pregnancy. A few of my mum friends also experienced similar things during pregnancy and doc said it was fine, but they still went for a check-up straightaway lah. Could be many things, but doctor needs to see you in person to confirm. Don't stress too much, sometimes these things happen, but do get it checked out today or tomorrow, boleh?