hcg levels & bleeding

Vanessa
9th day hcg 86
13th 470
15th 629
18th 1938
I've had a frozen embryo transfer of 2 embryos. On and off brown and pink discharge throughout. Today day 19 red blood when I first wiped a few times which now has turned to pink and brown with streaks of red after a few times to the bathroom . I'm devastated don't know what to think anymore.