Bleeding in early pregnancy.

How common is bleeding in early pregnancy? Little back story. By my calculations I am 5 wks 1 day I had a blood draw on 5/ 18 confirmed pregnancy hcg beta was 37.2 they want me to come in next week and do another blood draw okay no problem. Started light pink spotting today with miscarriage history. What should I do is it normal I'm freaking out immensely, some slight cramping too.