Am I at a higher risk of fat being injected into a vein if I have pelvic congestion syndrome and venous insufficiency?

I suffer from venous insufficiency and pelvic congestion syndrome. Is it safe for me to have a bbl? Am I at a higher risk of fat being injected into a vein? Also am I a high risk for a blood clot? How long after surgery can clots occur? How long after surgery do you need to be worried about any other complications? Also the venous insufficiency in my legs has caused trace of oedema in my ankles and calves and this is another area I want liposuction. Is it best to get this done at another time?