Question

I've had my IUD for almost 5 months now. I can't feel the strings and neither can my partner. Should I be concerned/call the doctor?

The main reason I am asking is because today at work I used the restroom and saw something in the toilet that looked like a string. I've been trying to google to see what the likely chances of the string coming out and am not finding much information. Any help would be great.

Thank you in advance.