BBT charting question...please help :)?

Has anyone ever had 4 days in a row of the exact same temperature? I took Clomid on days 5-9, had an HCG trigger shot on cycle day 13 and had an IUI on day 14. About 4 days after my IUI, my temperature was at 97.60 (just barely above my coverline...if i did the coverline right) and it has stayed there ever since. Is that something to be concerned about? What could this mean? Thanks for your help