Hello thanks for your query. I assume you are talking about the threads of your intra uterine device. As the question mentions oil threads which is definitely a typo. Feeling for the thread is a method of confirming that it hasnt slipped out. But there are other more reliable methods. Please visit a gynecologist who would try to visualize the threads per speculum. If not seen, then the device placement and position can be confirmed by a transvaginal pelvic ultrasound where it would definitely show up. Other options include having a hysteroscopy, removing the device, and having a new one fitted with intact threads so that you are not so anxious. Take care.