Early period

I had a sonohysterogram 2.5 weeks ago to plan for <a href="https://glowing.com/glow-fertility-program">ivf</a> ( didn't know that's what my appointment was for) and didn't follow the birth control pills given religiously at all and I still ovulated . No spotting with the procedure but I started my period over a week later (5 days early and for only 2 days) and had cramping after my period and that slowly tapered away but still had some brown discharge. I have had a negative test 2 days after the period ended but I feel very nauseated and exhausted. Any one else experience this before?