Will future pregnancy affect my BBL and lipo to my waist/back/arms?

While difficult to predict, the short answer is: Yes. Pregnancy will likely compromise the results of any cosmetic surgery which preceded it (to some degree)Family planning is a somewhat fluid process which may or may not conform to a schedule. Thus it becomes difficult to plan elective surgery around events that may come at some point in the future. 
The question of timing of elective body contouring as it relates to pregnancy is ultimately dependent upon expectations. There are a number of changes that occur during pregnancy (some more reversible than others) which may potentially compromise your overall aesthetic result. With this in mind, the best thing that can be done is understanding how your body may (or may not) change post pregnancy and preparing appropriately. 
It is important to remember that pregnancy changes more than just your weight. There will be changes in muscle and skin tone which in some cases will not return to baseline. The safest recommendation is to maintain a healthy lifestyle (diet and exercise) through pregnancy and afterwards. This will ensure a greater likelihood of a return to form. This is by no means a guarantee but it will help. Lastly, be prepared for the possibility (eventuality) of further procedures in the future to regain your pre-pregnancy form.
With regards to your specific question, it is typically prudent to delay any elective cosmetic surgery when a pregnancy is anticipated in the near future (2 years). This is a function of the unpredictable nature of the changes to follow which may alter or compromise the aesthetic result obtained. Liposuction reduces the potential for weight gain in a treated area by reducing the population of resident adipocytes (fat cells), however the remaining cells retain the ability to swell. I usually recommend that patients reach a healthy stable weight pre-operatively which they plan to maintain post-operatively (which is not compatible with a planned pregnancy in the near term).
As always, discuss your concerns with your board certified plastic surgeon (ABPS).

Many of the patients who undergo BBL and lipo have children after the procedures. I typically recommend that a patient wait at least six months to become pregnant after a BBL.  The procedure forever alters the distribution of fat in a favorable way. The effects of liposuction on the skin are variable based upon the elasticity of the skin.  The fat that lives in the buttocks from the procedure will get larger with weight gain and smaller with weight loss.Pregnancy can definitely change your overall shape, muscle tone, and skin laxity. Significant weight gains during pregnancy could affect the laxity of your abdomen which might require a TT after your family is complete.Kenneth Hughes, MD, Board Certified Plastic SurgeonLos Angeles, CA

Thank you very much for this  frequently asked question. Pregnancy has a great effect on most women's body. The fact that you have had surgery before it does not change that. Pregnancy will make most women gain weight. However fat cells, Once removed will not  regrow. Or once moved somewhere else, will not disappear.  They will only load up volume in fat like healthy fat cells do. This of course has an effect on your surgery outcome. It also means that areas where if you had Liposuction will likely gain weight and areas where you have a transfer of fat you will gain more. Naturally with weight gain all other associated problems like stretching of skin can be seen.
It is important however to point out that the fat transfer does not affect pregnancy. I hope this answers your question sufficiently. Have a wonderful rest of the day and greetings from the beautiful island of Jamaica.