Venogram with IVUS and ballooning of left common iliac vein today

I had a Venogram with ivus and a balloon in my left common iliac vein due to 50% compression due to May Thurner Syndrome. No stents or embolization. Just the one ballooning. My doctor wants me to start low dose baby aspirin and Plavix tomorrow morning and take it every day for 30 days. Is this routine??? I have terrible health anxiety and now I’m so freaked out about blood clots.