Is Lovenox Safe to Take Pre and Post-op BBL and Rhinoplasty?

Interesting that you are getting this combination of procedures.  This is the most frequent combination I perform because of my practice mainly focusing on rhinoplasty and buttock shaping.  With the proper management, you can still have surgery. This depends on the exact condition.  Your surgeon needs to work very closely with your internist or hematologist to make sure your pre-op and post op regimen is safe. A lot of this really depends on your exact level of risk.  I routinely give Heparin or Lovenox pre op and post op to my patients when indicated for tummy tucks  or long procedures etc.  You may want to skip the rhinoplasty however because facial procedures have higher bleeding risks.  Test this all out with the safer BBL first then consider the rhinoplasty later, if at all. 

If you are going to undergo surgery and have a predisposition to blood clots, then I would recommend using a blood thinner such as Lovenox to reduce your risk.  It is usually recommended that you begin the Lovenox about 12 hours after surgery.  If you begin prior to surgery, you are at higher risk of having bleeding complications. 
If you have a predisposition to blood clots, I would recommend that you only have one procedure at a time.  Do not combine surgeries. The added surgeries will increase your risk of having clots. 
You need to understand.... Even if you use the blood thinners, you still have a risk of having a blood clot. 
Talk with your hematologist.