For 2. Weeks I've been bleeding brown blood I'm 16 weeks pregnant and sometimes there is a pulling pain in my uterus. I've been to the early pregnancy unit and they said everything is find and they can't see where the bleeding is coming from, I've also spoken to my midwife and she came to my house on Saturday she checked babies heartbeat and it was 145-153. I can't help but worry is this normal?!