How safe is Botox and filler on a patient who suffered deep vein thrombosis and pulmonary embolism during pregnancy?

There should be no thromboembolic effect from routine botulinum toxin injection. Fillers always have a small risk of inadvertent injection into vessels, but I suspect that risk is similar in or out of pregnancy. Bigger elective surgical procedures like facelifts should probably deferred until after pregnancy, both due to anesthesia issues and the recognition that pregnancy will likely change your appearance, temporarily but also permanently. Better to wait to see how things settle our, literally.
Congratulations on the pregnancy!