Too early for implantation bleeding?

Larina

I had my seventh (yes, you read that right- that many) <a href="https://glowing.com/glow-fertility-program">IUI</a> last Thursday, six days ago. The <a href="https://glowing.com/glow-fertility-program">IUI</a> was at 11:30am. Today, close to 5:00pm, I had very light brownish spotting. At first I was thinking "OMG can that be implantation bleeding!?!) but then I thought that it might be too soon. One Glow article puts implantation bleeding as not starting till day seven. I'm trying not to go crazy here, spinning around in mental circle going from thinking this time could be THE time to thinking that the spotting means the <a href="https://glowing.com/glow-fertility-program">IUI</a> failed. Again. I'm stuck between trying to guard my heart and wanting hope (anyone who says hope can't be false has never had six failed IUIs). What do you all think? Could it be implantation bleeding again, a bad sign or meaningless?