Pelvic floor, pelvic floor, pelvic floor.
TBH there isn't much they will do if you plan to have more children. Any ops good work will be undone if you have another baby so they end to wait till childbearing is over and done with. And they usually wait till at least a year has passed after having a baby before they do anything. They prefer to give nature time to heal. Nerves can take up to a year to repair etc. Mostly though they won't operate unless there is a real problem long term. Generally things just need time.
Stress incontinence is normal after having a baby. If you do pelvic floor exercises lots it will help.
Doesn't sound like its too bad for you if its only really a problem when sneezing or coughing atm. Keep on with pelvic floor and it should improve over time.