My ovulation complete before 18 days but still can't get period then urine test also negative what's the reason I have taken progesterone tablet used in viginal area

The most likely reason why you haven’t received your period yet and tested negative on a urine test despite ovulating before 18 days is due to low levels of progesterone. Progesterone is a hormone that plays an important role in regulating the menstrual cycle, stimulating the growth of the uterine lining and preparing it for implantation should fertilization occur. When progesterone levels are too low, it can cause irregularities in the menstrual cycle or even prevent ovulation altogether.

Taking a progesterone supplement vaginally can help to restore balance and regulate the reproductive hormones so that your body functions as normal again. However, you should always speak with your doctor if you have any questions or concerns about taking any type of medication - hormonal or otherwise - to ensure that it won't interfere with other medications, supplements or treatments that you may be taking at this time.