I would vote for waiting after pregnancy to have the implants removed. That way, if additional surgery may be necessary to correct post-pregnancy/breast-feeding changes, it can be done at the same time.
What your breasts will look like after explantation depends on several factors such as: the quality of skin elasticity (the better the elasticity the better the skin will bounce back), the size of the implants used (the larger the implant the more trouble you may have with redundant skin), and the amount of breast tissue present at this time (which may have changed since the time of your breast augmentation).
Life experience since your breast augmentation procedure, such as pregnancy or weight gain weight loss, will potentially influence the factors discussed above. If you take these factors into consideration and apply them to your specific circumstances you may get a good idea of what to expect after the implants are removed.
Occasionally, I see patients who just want the implants removed because they don't want the implants "to be a part of them" anymore. Make sure you think about this and that this is the right thing for you. It's difficult to say if you need a lift after removal -- no one will know exactly what your breasts will look like after the implants are removed until it is done. Talk to a well-trained and experienced board-certified plastic surgeon and get good advice.