It is common, especially in engineering applications, to represent the specific gas constant by the symbol R. In such cases, the universal gas constant is usually given a different symbol such as R to distinguish it.
If it is hormone incorporated iud like Mirena (levonorgestrel) you bleed few days from removal of iud (3-5) days but then you have hormone withdrwal bleeding for few days after iud removal which may last fdor 3-5 days. ...Read more. See 1 more doctor answer.
Having this issue as well. IUD removed 2 weeks after my period. It has been out for a month, and I am now 3 weeks late. Numerous HPT were negative. I have had sore breasts for the last week (usually happens 2 or 3 days before my period), but still nothing.