So I had my period 2 weeks ago it lasted 4 days. Then 3 days later I had pink bleeding sorry for the…

So I had my period 2 weeks ago it lasted 4 days. Then 3 days later I had pink bleeding sorry for the tmi. I have the paragrad IUD. The pink bleeding lasted 2 or 3 days has anyone with paragrad experienced this before. And I cannot find the string. I felt for it and so did my boyfriend. We both didn t feel it. I am nervous.