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. This is a function of the unpredictable nature of the changes to follow which may alter or compromise the aesthetic result obtained. I usually recommend that patients reach a healthy stable weight pre-operatively (which is not compatible with a planned pregnancy in the near term). If the anticipated gap is more significant (5 years or more) the risk of compromising your result with a pregnancy is probably on par with the risk compromising it over time regardless. In summary, a procedure in the present will not affect a pregnancy in the future, however, the same cannot be said for the opposite. A pregnancy in the future will potentially compromise the aesthetic outcome of an augmentation performed in the present. If that is a risk that one is willing to assume, then proceed to surgery, if not, delay.In regards to your additional question, typically a second procedure will add to the cost (i.e. an augmentation with mastopexy/lift will be more expensive than an augmentation alone). As always, discuss your concerns with a board certified plastic surgeon (ABPS).