Spotting or just from iui?

Hi I’m trying not to get my hopes up but I’m 5dpiui and this morning at 4am I had stabbing pains that woke me, this afternoon at work I went to the toilet and had brown blood on the paper it happened twice would this be from <a href="https://glowing.com/glow-fertility-program">iui</a> 5 days ago or could it be early spotting?