No, the FDA did not say that the Pfizer COVID-19 vaccine causes blood clots - PolitiFact

"This study does not tell me much. There have been many other studies on mRNA vaccines that did not show this relationship," he said. "It is common for 'weak' studies to show conflicting results, which is why they cannot be used to determine causation."… 

 Meanwhile, recent studies have shown an increased risk of blood clots from contracting the COVID-19 virus.

https://www.politifact.com/factchecks/2022/dec/20/instagram-posts/no-fda-did-not-say-pfizer-covid-19-vaccine-causes/

Anti-Vaxxers Are Obsessed With Photos of ‘Jelly’ Blood

"Vaccinated patients have lower risks of blood clots overall," Crowther explained, "because they have a lower chance of developing the severe COVID cases associated with catastrophically high risks of developing blood clots."…

https://www.thedailybeast.com/anti-vaxxers-are-obsessed-with-photos-of-jelly-blood