There are 5 types of pelvic organ prolapse, bladder is one of them, rectum is another. For more info on POP, please read this article.
http://www.medhelp.org/health_pages/Womens-Health/Taking-Pelvic-Organ-Prolapse-Out-of-the-Closet/show/1148?cid=591
It is very common to still feel that bulge so soon post surgery, it takes time for the tissue swelling to go down. It is very important that you don't lift anything heavy for 6 weeks post surgery (including children), you want to be completely healed prior to putting pressure on the pelvic cavity.
At the point you feel you need additional repairs, I highly recommend you see a urogynecologist, POP is a very intricate surgery and seeing a specialist increases the potential for a successful outcome.
If you have any other questions during your heal curve send them over to the pelvic organ prolapse forum (I'll have this post transferred there as well). I've had surgery for 3 of the 5 types of POP and can fill in the blanks for you.
Sher