Bleeding in early pregnancy.

So I started heavily bleeding last Saturday and went to the early pregnancy unit and had an internal ultrasound scan. The nurse said that it was implantation bleeding as it was not surrounding the yolk sac it was further up. However, yesterday i started bleeding again and it has been going from heavy to light, vice versa and being all different colours from red to pink to brown. I have rang the early pregnancy unit and they said to wait and see, i’m worrying as to what it is now. Has anybody else had this and gone on to have a healthy pregnancy? I am 5 weeks and 6 days and my next appointment for a check up scan is in 9 days. Help please??!