I had CVS done at around 15 weeks (as I didn’t want to wait until 16 weeks for the amniocentesis) but I think they are almost identical procedures, just CVS is taking a sample of the placenta rather than the amniotic fluid. I was so nervous ahead of the appointment because of the risks involved and the potential of finding out bad news but the consultant, doctor and midwife who carried it out were so lovely and made me feel really at ease. They said I could watch/listen to something on my phone as a distraction but I wanted to feel present so just watched the sonograph screen instead. Pain wise it felt like a punch to the stomach (I don’t know how to word that without making it sound scary, because it really didn't *hurt*, just took my breath away for a second) and then the next 24-48 hours I just felt very tender like bad period pains. The procedure itself took less than 10 minutes and really wasn’t too bad, although I made the mistake of looking at the needle near the end which made me feel a bit light headed
I feel like the CVS would be more painful as it is taking a sample of the placenta rather than the fluid, so I hope it may not be as uncomfortable for you. They told us the gender of the baby which was so lovely and we got our results back about 3 days later I believe, which thankfully were all clear. I am 37 weeks now and have a little scar on my tummy.
Sorry for the essay but I hope this reassures you, make sure to take it easy after the appointment too. I took the next day off work and made sure not to lift anything heavy or do too much. Good luck