HI. I have the mirena. My OBGYN could not find the strings at my yearly appointment a week and a half ago so she scheduled an ultrasound. She saw the IUD on the ultrasound but also found fluid. She could not explain the fluid, but now I am late for my monthly cycle to begin.

could i be pregnant and is that what the fluid was but i was only about 3 weeks pregnant so nothing showed on the ultrasound yet? IF not pregnant, then what is the pocket of fluid from?