Had my 3rd

<a href="https://glowing.com/glow-fertility-program">IUI</a>

this cycle. Tested bfn 14dpiui. Then spotting 15dpiui, then not until next morning, flow, which never happens. I usually jump into flow immediately. Then I bleed fairly heavy a day, normally I bleed heavy 2 days. Now period almost came to a complete stop. I don't think i could be pregnant but am wondering why my period is behaving this way? This has never happened before. Any insight? Thanks!